[spoiler] Akai Family, it all makes sense now.

[jahithber]

Spoiler:

First of all let's start with the Akai family facts:

1. Shuichi and Sera look like their mother.
2. The middle brother looks like their father.
3. The father passed away some time ago, the cause of death is unknown.
4. There is an unknown, possibly female, child that looks like Shuichi and Sera, who possesses an intelligence level that's abnormal to her apparent age, indicating that she is a surviving victim of APTX. She also has knowledge about spying since she examined the bug left behind by Conan.
5. According to Sera she has no other relatives besides her Mother, Father and 2 brothers.
6. Sera's middle brother knows about Conan and his deductive prowess.

Here's a few thing we can take an educated guess:
1. Shuichi and Sera both suspect Conan to be Shinichi. In order to suspect such a seemingly impossible scenario, they probably already know the effect of APTX. And the source of such a knowledge is from the unknown child, which presumably is their mother.
2. Based on the assumption above, the unknown child is Shuichi and Sera's mother. And she has consumed APTX.
3. The mother has possible connection to the BO due to her consumption of APTX. She is quite possibly an undercover in the BO, which was discovered and forced to consume APTX.

Now, look at a few more facts about Amuro:
1. After the newest manga, we know he is an undercover.
2. Amuro hates Shuichi because something happened to a man they both know.
3. Amuro is one of the few people that know Conan's deductive prowess.
4. Shuichi and Amuro seem to know each other even before Shuichi joined the BO.
5. Amuro knows Sera based on the fact that he wondered why Sera was in Japan when he first saw her.
6. Amuro was treated by Elena Miyano at a very young age, suggesting that he was taken care of by someone working in the BO.

Here's a few thing we can guess based on the facts:
1. Amuro's parents were working inside the BO, and that's why he was treated by Elena Miyano at an young age.
2. Amuro's parents were possibly undercover in the BO because Amuro later also worked as an undercover.
3. The person that causes Amuro to hate Shuichi for is probably his father, who was killed on the undercover duty.
4. Since Amuro and Shuichi both know Amuro's father, and Shuichi's father was dead, Amuro's father might also be Shuichi's father.
5. This also explains why Shuichi and Sera's mother has consumed APTX. Their mother was possibly also an undercover and got her cover blown and was forced to consume APTX.
6. We also know that Amuro was surprised Sera when he first saw her in Japan. This shows that he knows Sera and she was in the US prior. As for why, it would only explain that he is somewhat aware of her whereabout. This indicates that he is possibly her middle brother.
7. And based on the fact that Sera's middle brother is a very good detective and knows about Conan when seeing Conan's picture, in addition to the assumptions above, we can guess that Amuro is the middle brother of the family.
8. Lastly, we can also guess that their father sacrificed himself on the job to save Shuichi during one of the missions, thus creating Amuro's hatred toward both Shuichi and the FBI, thinking that Shuichi caused their father's death and the FBI was too incompetent to protect their own men. This also explains Amuro being an undercover not from the FBI.

So there you have it:

The father is an undercover in the BO, is killed on duty, and is possibly an FBI agent.
The mother is force fed APTX by the BO and shrunk, and is the unknown child we see in Sera's Hotel. She is also possibly an FBI agent.
The elder brother is Shuichi, who joins the FBI to persuade his father's goal to take down the BO.
The middle brother is Amuro, who joins a police force not from the FBI, to spite the FBI and Shuichi, and is also an undercover in the BO.
The younger sister is Sera, who comes to Japan to investigate Shuichi's death.

[sherryx]

Good theory, but I don't think the 'Amuro as middle brother' thing works out.

Since I vaguely remember Haibara saying something to the effect of 'no one else who took the APTX lived', I believe that if the child is the Akai family mother and took (probably an earlier version of the) APTX, it would have to be quite some time ago. If so, Amuro would probably be a child when that happened and would likely still be around his family, and so would know about the shrinking effects of the apotoxin just like Shuichi and Sera currently do. However, from recent chapters, Amuro doesn't appear to consider the possibility of Conan being shrunk and just thinks that he is really intelligent.

Additionally we know that Amuro was probably raised in or around the BO when he was young. From Akemi and Shiho, we know that the BO keeps a close eye on their members' children, even if they are not judged to be useful, like Akemi. If Akai is Amuro's brother, he would not have entered the BO undercover as some random new member.

From Sera's cellphone interactions with her middle brother, he seems to be kind of... free. Because he replies pretty fast and all that. I think Amuro might be too busy to constantly reply Sera about stuff like that. It would also be kind of dangerous for him to do so, because he hung out around Vermouth so much. It's kind of similar to Kir not being able to update the FBI much about what's happening.

It was interesting that you pointed out that Amuro recognised and was surprised to see Sera in Japan though, which I didn't really notice before.

[jahithber]

Spoiler:

Good theory, but I don't think the 'Amuro as middle brother' thing works out.

Since I vaguely remember Haibara saying something to the effect of 'no one else who took the APTX lived', I believe that if the child is the Akai family mother and took (probably an earlier version of the) APTX, it would have to be quite some time ago. If so, Amuro would probably be a child when that happened and would likely still be around his family, and so would know about the shrinking effects of the apotoxin just like Shuichi and Sera currently do. However, from recent chapters, Amuro doesn't appear to consider the possibility of Conan being shrunk and just thinks that he is really intelligent.

Not necessarily, Haibara only says that based on what she knows. However it appears that APTX is not developed by just herself so we couldn't be sure her statement is entirely reliable (plus she said that very early in the series, but Gosho at the time did not predict the series to be running for this long, so he probably made some minor mistakes in the statement). About the unknown child, we couldn't be sure about the time which the "mother" took APTX. We could only guess that it happened right around the time the "father" was killed, which we can assume to be 5+ years ago. This is supported by her apparent age to be that of a middle schooler. All known victims of APTX right now shrunk to the age of elementary school, so we can assume the unknown child too has shrunken to that age, but has since then grew up to age that of a middle schooler. We can guess from this that she probably has consumed APTX about 5 or 6 years ago prior to the story right now. That does fit the time frame in which Shuichi joined the organization, which is also 5 years ago

Additionally we know that Amuro was probably raised in or around the BO when he was young. From Akemi and Shiho, we know that the BO keeps a close eye on their members' children, even if they are not judged to be useful, like Akemi. If Akai is Amuro's brother, he would not have entered the BO undercover as some random new member.

We do have an example of family infiltration in case of Kir though. She and her father both worked undercover at the same time, so this is not entirely impossible. Another possible explanation is that, maybe Amuro and Shuichi's parents did indeed work for the BO for real, but this explanation contradicts with Shuichi joining the BO as an undercover.

From Sera's cellphone interactions with her middle brother, he seems to be kind of... free. Because he replies pretty fast and all that. I think Amuro might be too busy to constantly reply Sera about stuff like that. It would also be kind of dangerous for him to do so, because he hung out around Vermouth so much. It's kind of similar to Kir not being able to update the FBI much about what's happening.

Amuro is known to spend a lot of time investigating Conan. Sera is a source of information. So I don't think Amuro would be too busy for other stuff. He is busy with investigating Conan, therefore getting information from Sera constantly can be explained. As for why he is able to communicate freely, I think this is due to he having some vital information about Vermouth's relationship with the Boss. We already see that he can quite freely do his own investigations without much interference from the BO. In Kir's case, I believe she is not as much an important asset as Amuro, and she was a undercover suspect, so she is probably under supervision with the organization constantly.

It was interesting that you pointed out that Amuro recognised and was surprised to see Sera in Japan though, which I didn't really notice before.

That was the case in which Conan was abducted by the murderer and Amuro was chasing after them only to be cut off by Sera on her motorcycle. He thought to himself on why Sera was in Japan, meaning he knows Sera was probably in the US prior

[jimmy_kud0_tv2]

Given your theory, what do you think of Masumi after the Mystery Train story? During the train story she sees someone who looks exactly like her "Shuu-nii" and is then tazed and unconscious for most of the rest of that story. The next couple times she appears she keeps asking Ran about the hat that was found in the hall way, giving the impression that Masumi still thinks that the person she saw was her "Shuu-nii" since she keeps holding on to the hat. However, she has never actually spoken the names of her brothers to the other main characters and continues to insist that her oldest brother, who we all assume to be Shuuichi, to be dead. Why continue to say this if Shuu is the oldest brother and she had seen someone who looks like him and is convinced that the hat that was found belonged to him? Added to this, in the case where Masumi witnessed the deduction battle between Heiji and Conan(Shinichi) we find out at the end that its possible that James Black knows exactly who she is and identifies her as a girl when everyone else says guy at first. James Black is also revealed to know later on in the Scarlet Return arc that Shuuichi had glue on his hands before he was "shot" and had probably faked his death somehow. Is it possible that Masumi was told by James Black that Shuuichi could be alive somewhere? Why still say he is dead?


Also as another person somewhere else on this forum mentioned, Masumi is really adamant about meeting Haibara before the Mystery Train story, but after seeing her for all of like 10 seconds on the train and then getting tazed later, she never really asks to see or talk to Haibara again... and then we become aware of the mystery middle school girl who is said in one of Sherry's Soliloquys to resemble Haibara. How does Haibara relate to your theory?


Also since Rei has dark colored skin, both now and in the flashback where he is treated by Elena, and is supposed to resemble the father in this scenario does that mean that the father also has dark skin? It would be pretty weird to me if Rei was the middle brother, resembled the father, but the father was somehow light skinned or similar skin color to the rest of the Akai family. Also the hand holding the phone that received the picture of Conan was a light skinned hand, and we know that Rei had dark skin even back when he was a kid. How would you explain this?


Also if Rei was the middle brother and the middle brother's school friends knew this, wouldn't they at the very least find it odd that the sister of their friend is a different skin color, even if they had been told before hand? Even if I knew that my friend and their relative were different skin colors I'd still ask how that happened or how it effects the life of the person simply because it would seem like an interesting story. The first person that calls out to Masumi, Ran and Sonoko in the Red Woman case just assumed that the three girls where the ones she was looking for with out even questioning anything at all.

[Kor]

Here's a few thing we can take an educated guess:
1. Shuichi and Sera both suspect Conan to be Shinichi. In order to suspect such a seemingly impossible scenario, they probably already know the effect of APTX. And the source of such a knowledge is from the unknown child

On Akai, he can deduce Conan is Shinichi because Conan was careless (dunno what the hell he expected when he let him stay in his house), plus we know Akai knows about Haibara, so we already had that precedent before the mystery child or middle brother ever been referenced or appeared in the manga.

...which presumably is their mother.
2. Based on the assumption above, the unknown child is Shuichi and Sera's mother. And she has consumed APTX.
3. The mother has possible connection to the BO due to her consumption of APTX. She is quite possibly an undercover in the BO, which was discovered and forced to consume APTX.

While mystery child could be the mother, building any farther theories out of it seems like a bad idea at this point. It's still just in the realm of a guess, after all.
Plus, another undercover in the BO? I'm very hopeful Gosho's aware he already went overboard on this whole undercover business, and we wouldn't have to deal with any other infiltrators.

4. Shuichi and Amuro seem to know each other even before Shuichi joined the BO.

Based on what are you making this claim?

Here's a few thing we can guess based on the facts:

We can guess many things based on these facts, actually. Sorry if it's going to seem like I'm going to pick on you, but your rhetoric seems kinda flawed because you base your theories on guesses.

2. Amuro's parents were possibly undercover in the BO because Amuro later also worked as an undercover.

Or Amuro independently became an undercover agent.

3. The person that causes Amuro to hate Shuichi for is probably his father, who was killed on the undercover duty.

Scotch was noted to be an agent of the Secret Police. Moreover, the BO don't know his name. If he was indeed Amuro's father, who's been in the BO for years, why wouldn't the BO be able to figure out his name in some way? Plus, if Amuro resembles him, then it's a bit problematic to begin with, isn't it?

Unless you're assuming Scotch isn't the person Amuro hates Akai over.

4. Since Amuro and Shuichi both know Amuro's father, and Shuichi's father was dead, Amuro's father might also be Shuichi's father.

A guess that relies on a guess that relies on a guess.

5. This also explains why Shuichi and Sera's mother has consumed APTX. Their mother was possibly also an undercover and got her cover blown and was forced to consume APTX.

You might want to make a timeline that somehow explains when every specific event you describe took place, because this seems kinda disoriented like this.

7. And based on the fact that Sera's middle brother is a very good detective and knows about Conan when seeing Conan's picture, in addition to the assumptions above, we can guess that Amuro is the middle brother of the family.

Unlikely. You can see middle brother's hand in one of the panels, and it's pretty evident the skin tone doesn't resemble Amuro's

Spoiler:

8. Lastly, we can also guess that their father sacrificed himself on the job to save Shuichi during one of the missions, thus creating Amuro's hatred toward both Shuichi and the FBI, thinking that Shuichi caused their father's death and the FBI was too incompetent to protect their own men. This also explains Amuro being an undercover not from the FBI.

No such thing has ever been said about Akai's father, and no such FBI agent has been referenced or hinted at. Akai is considered such a big deal because it was an incredible feat for him to infiltrate the organization. If anyone and their mother (and father) could so easily do so, then this secret evil crime organization simply sucks.

We could only guess that it happened right around the time the "father" was killed, which we can assume to be 5+ years ago.

Akai only infiltrated the organization 5 years prior to the series.

The father is an undercover in the BO, is killed on duty, and is possibly an FBI agent.

Any evidence from the manga?

The middle brother is Amuro, who joins a police force not from the FBI, to spite the FBI and Shuichi, and is also an undercover in the BO.

Why would Amuro want to spite the FBI?

My overall point is, you rely too much on guesses and assumptions. You should show some evidence from the manga.

[sherryx]

I'm not sure why there is a need for spoiler boxes here because it makes it hard for me to address the different points T.T I split your replies up to answer better, hope you don't mind.

Spoiler:

Not necessarily, Haibara only says that based on what she knows. However it appears that APTX is not developed by just herself so we couldn't be sure her statement is entirely reliable (plus she said that very early in the series, but Gosho at the time did not predict the series to be running for this long, so he probably made some minor mistakes in the statement). About the unknown child, we couldn't be sure about the time which the "mother" took APTX. We could only guess that it happened right around the time the "father" was killed, which we can assume to be 5+ years ago. This is supported by her apparent age to be that of a middle schooler. All known victims of APTX right now shrunk to the age of elementary school, so we can assume the unknown child too has shrunken to that age, but has since then grew up to age that of a middle schooler. We can guess from this that she probably has consumed APTX about 5 or 6 years ago prior to the story right now. That does fit the time frame in which Shuichi joined the organization, which is also 5 years ago

I agree about the Haibara and Gosho point, which is why I didn't say that the mysterious child being the mother is impossible. All I said was that if the child was the Akai family mother, it would have to have happened quite some time ago such that Haibara does not know about it. Regarding the time frame of the Akai family, I believe Kor has explained the problem already (father dying 5+ years ago but Shuichi only infiltrating 5 years ago).

You are not addressing my main point. Whether or not the mysterious child is actually the mother is not an issue. Since your theory holds that the mysterious child is the mother, I can make the assumption that it is true here. My main point is that if the mother shrank quite some time ago, while Amuro is young enough that he is still living with his family and hence knows about the possibility of shrinking, how is it that he doesn't consider the possibility that Conan is someone who shrunk too? In fact, from the recent chapters, it doesn't seem like Amuro knows that it is possible to de-age at all.

Spoiler:

We do have an example of family infiltration in case of Kir though. She and her father both worked undercover at the same time, so this is not entirely impossible. Another possible explanation is that, maybe Amuro and Shuichi's parents did indeed work for the BO for real, but this explanation contradicts with Shuichi joining the BO as an undercover.

Kir's family situation is different. It's not explicitly stated, but it appears that Kir and her father pretended to be unrelated in the organisation (File 604). This is not possible for Akai Shuichi if he is really Amuro's brother. Amuro probably grew up in the Org, so according to this theory, it is likely that the BO would know the entire Akai family and their actual relationship with each other. They can't pretend to be unrelated. Also your theory would imply that Shuichi grew up in the BO, somehow managed to escape it, join the FBI, and then appear to re-join the BO as a random new member that no one recognises, which is... highly implausible.

As a side note, if they were brothers, it is unlikely that Shuichi would have to investigate so much to figure out that Amuro is actually Furuya Rei, even with a surname change.

Spoiler:

Amuro is known to spend a lot of time investigating Conan. Sera is a source of information. So I don't think Amuro would be too busy for other stuff. He is busy with investigating Conan, therefore getting information from Sera constantly can be explained. As for why he is able to communicate freely, I think this is due to he having some vital information about Vermouth's relationship with the Boss. We already see that he can quite freely do his own investigations without much interference from the BO. In Kir's case, I believe she is not as much an important asset as Amuro, and she was a undercover suspect, so she is probably under supervision with the organization constantly.

Amuro's priority has always been Akai Shuichi. And Sera normally texts her older brother to ask him for help with cases. The middle brother didn't even know that Sera knew Conan until that page that Kor put in spoilers earlier so it's unlikely that the middle brother texts Sera for the information he can get on Conan. You're right that Amuro does his own thing most of the time, but his personal investigation includes being around Vermouth a lot. From Amuro's POV, Vermouth is related to Anokata and he doesn't know Vermouth's soft spot for Conan = Vermouth is very dangerous to do anti-BO stuff around and he has to be careful.

[jahithber]

Given your theory, what do you think of Masumi after the Mystery Train story? During the train story she sees someone who looks exactly like her "Shuu-nii" and is then tazed and unconscious for most of the rest of that story. The next couple times she appears she keeps asking Ran about the hat that was found in the hall way, giving the impression that Masumi still thinks that the person she saw was her "Shuu-nii" since she keeps holding on to the hat. However, she has never actually spoken the names of her brothers to the other main characters and continues to insist that her oldest brother, who we all assume to be Shuuichi, to be dead. Why continue to say this if Shuu is the oldest brother and she had seen someone who looks like him and is convinced that the hat that was found belonged to him? Added to this, in the case where Masumi witnessed the deduction battle between Heiji and Conan(Shinichi) we find out at the end that its possible that James Black knows exactly who she is and identifies her as a girl when everyone else says guy at first. James Black is also revealed to know later on in the Scarlet Return arc that Shuuichi had glue on his hands before he was "shot" and had probably faked his death somehow. Is it possible that Masumi was told by James Black that Shuuichi could be alive somewhere? Why still say he is dead?

Not quite sure what you are asking, but I'm assuming that you are asking what Sera knows at this point. Even after the latest story, I'm assuming that she doesn't know Shuichi is alive, since the BO still doesn't know Shuichi is alive yet (Amuro never told Vermouth about what he found out, and he is likely to keep it a secret from Sera as well, for the best interests of Shuichi and Kir). She should know that Conan and Haibara are APTX victim, but might or might not know who they are before they shrunk.

Also as another person somewhere else on this forum mentioned, Masumi is really adamant about meeting Haibara before the Mystery Train story, but after seeing her for all of like 10 seconds on the train and then getting tazed later, she never really asks to see or talk to Haibara again... and then we become aware of the mystery middle school girl who is said in one of Sherry's Soliloquys to resemble Haibara. How does Haibara relate to your theory?

I believe she is interested in Haibara because she is aware of the effect of APTX, and she might have received photos of Haibara directly or indirectly from Shuichi, which means Shuichi is probably protecting Haibara. Sera wants to protect her so she wants to learn a bit about her.

Also since Rei has dark colored skin, both now and in the flashback where he is treated by Elena, and is supposed to resemble the father in this scenario does that mean that the father also has dark skin? It would be pretty weird to me if Rei was the middle brother, resembled the father, but the father was somehow light skinned or similar skin color to the rest of the Akai family. Also the hand holding the phone that received the picture of Conan was a light skinned hand, and we know that Rei had dark skin even back when he was a kid. How would you explain this?

We don't know how the father looks like. The only information to the father we can guess right now is that his code name is Scotch. Skin tune doesn't work like chocolate. It's related to the expression of the genes. We know the mother has light skin at least, and there are cases where one of the parents has dark skin and one has light skin but children have either dark skin or light skin. As for the hand, it could be it was under a disguise, as we see Scar Akai is light skin (but he is Amuro in disguise, who has dark skin. Gosho could intentionally make it so it doesn't give away too much about the middle brother)

Also if Rei was the middle brother and the middle brother's school friends knew this, wouldn't they at the very least find it odd that the sister of their friend is a different skin color, even if they had been told before hand? Even if I knew that my friend and their relative were different skin colors I'd still ask how that happened or how it effects the life of the person simply because it would seem like an interesting story. The first person that calls out to Masumi, Ran and Sonoko in the Red Woman case just assumed that the three girls where the ones she was looking for with out even questioning anything at all.

I think the fact that they find Sera look like a boy and doesn't look like her middle brother at all is already odd enough they didn't consider the skin tune difference to be anything worth mentioning. Plus it is not polite to comment on girls skin color in Japan. Unlike in the Western culture, where darker skin is considered more beautiful and healthy, in Asian culture, darker skin tune is associated with lower class and peasants.

[RoboG55]

Unlikely. You can see middle brother's hand in one of the panels, and it's pretty evident the skin tone doesn't resemble Amuro's

Spoiler:

Spoiler:

Was the panel with the middle brother's hand in the anime though? O_o *goes to check*
*returns* Yes it was! The middle brother not only has light skin but is right-handed and has a black (or dark blue maybe?) phone. Can't tell what type though... T_T But they could also be amibidextrous or something... *sigh* it's impossible to tell from just a single panel or a few seconds of a hand! But with the skin color it's definitely not Amuro! Or it could be that he was wearing a disguise at that time? But that's unlikely. . . and anyway from the Scarlet Series when Amuro was having a conversation with Akai it didn't give off anything that could mean they're siblings... it definitely isn't like the conversations my brothers and I have... T_T

[jahithber]

Here's a few thing we can take an educated guess:
1. Shuichi and Sera both suspect Conan to be Shinichi. In order to suspect such a seemingly impossible scenario, they probably already know the effect of APTX. And the source of such a knowledge is from the unknown child

On Akai, he can deduce Conan is Shinichi because Conan was careless (dunno what the hell he expected when he let him stay in his house), plus we know Akai knows about Haibara, so we already had that precedent before the mystery child or middle brother ever been referenced or appeared in the manga.

For a person like Shuichi, who is logical and reasonable, it'd take some very HARD and SCIENTIFIC evidences to make him believe someone can shrink. He is not some UFO chaser or Yeti hunter. For him to be able to realize what happens, he needs to see it first hand, like for example his mother has taken APTX and shrunk.

...which presumably is their mother.
2. Based on the assumption above, the unknown child is Shuichi and Sera's mother. And she has consumed APTX.
3. The mother has possible connection to the BO due to her consumption of APTX. She is quite possibly an undercover in the BO, which was discovered and forced to consume APTX.

While mystery child could be the mother, building any farther theories out of it seems like a bad idea at this point. It's still just in the realm of a guess, after all.
Plus, another undercover in the BO? I'm very hopeful Gosho's aware he already went overboard on this whole undercover business, and we wouldn't have to deal with any other infiltrators.

It doesn't explain why her mother has shrunken unless it has something to do with BO, either because she was investigating or working for the BO. All known victims of APTX have been related to the BO via the ways I just mentioned (Conan was investigating the BO, and Haibara was working for the BO). We already have 5 known undercovers, Amuro, Shuichi, Kir, Scotch and Kir's father. I don't see why it's unreasonable. Plus Scotch's identity is still unknown, so it is possible the father is Scotch. The mother might be a member of the BO, but defected later.

4. Shuichi and Amuro seem to know each other even before Shuichi joined the BO.

Based on what are you making this claim?

Based on Shuichi's mission. When he first joined, he investigated Amuro. If he didn't know about Amuro's existence he wouldn't investigate him. Amuro is a very careful person. In order to know about his existence would require people of Conan's caliber. Shuichi didn't know Amuro was also an undercover, so he must know him via some other means. FBI didn't know about Amuro's existence until Kir told them about the codename bourbon. All evidences points to Shuichi knowing Amuro on a personal level.

Here's a few thing we can guess based on the facts:

We can guess many things based on these facts, actually. Sorry if it's going to seem like I'm going to pick on you, but your rhetoric seems kinda flawed because you base your theories on guesses.
I didn't base my theories on pure guesses. Some of them are based on facts, and others are based on the theories that are more likely true

2. Amuro's parents were possibly undercover in the BO because Amuro later also worked as an undercover.

Or Amuro independently became an undercover agent.
It's just a theory. your theory can be true too, because I couldn't prove otherwise. But that doesn't mean my theory is false. However, we know that in fictions, people do what they do because they have a childhood related to what they do. For example, Conan becomes a detective because his dad is a detective. Jodie joins the FBI because her parents were killed by the BO. Kir joins the CIA because her father is her role model and is also a CIA agent. Ran practice Karate because her father practices Judo. Ai does her research on APTX because her parents were also researching APTX. The example goes on and on. Amuro joins the BO investigation because something happened in his childhood that causes him to resent the BO. We already know he was related to the BO at a very early age. It's logical to guess something happened to his parents and caused him to become an undercover.

3. The person that causes Amuro to hate Shuichi for is probably his father, who was killed on the undercover duty.

Scotch was noted to be an agent of the Secret Police. Moreover, the BO don't know his name. If he was indeed Amuro's father, who's been in the BO for years, why wouldn't the BO be able to figure out his name in some way? Plus, if Amuro resembles him, then it's a bit problematic to begin with, isn't it?

Unless you're assuming Scotch isn't the person Amuro hates Akai over.

Scotch being an agent of the Secret Police doesn't mean Amuro cannot be his son. And since it's very likely that Shuichi's mother has consumed APTX, therefore the BO is likely to know about how she looks like. But we know Shuichi looks like his mother, but he still somehow sneaked into the BO as an undercover. So it's not impossible for Amuro to become an undercover. Plus the BO boss is also a detective freak and rely on evidences to prove a point. As long as he cannot prove the relationship between Amuro and Scotch, Amuro can get away. The reason Conan lives today is also probably due to that. Remember Conan is basically a lookalike to Shinichi when he was young. When a victim of APTX went missing without confirmation of death, and a lookalike appears the next day, the boss will know. But he is not a person that will kill without proofs.

4. Since Amuro and Shuichi both know Amuro's father, and Shuichi's father was dead, Amuro's father might also be Shuichi's father.

A guess that relies on a guess that relies on a guess.

Shuichi's father is dead, that's a fact. Shuichi and Amuro mourn the same person, that's also a fact. And here is an additional fact, Detective Conan is a fiction, and a commercial fiction as well (meaning things that get published will always have a function in the story). Gosho does not tell us about the death of Shuichi's father to make us feel pity towards him, he tells us because it has a function in the story. With that said, the first theory we can come up with is that, the person Shuichi mourns is his father. This theory is quite simple and observational. But this also leads to the next theory, since Shuichi mourns his father, and he and Amuro mourn the same person. Amuro also mourns Shuichi's father. This is the logical step and doesn't involve any guessing. Then we have another fact. Amuro has been brought up inside the BO. It's because either his parents are dead, and someone inside the organization acted as a surrogate parent, or his parents work inside the BO either as undercovers or members of the BO. It's unlikely to be the former because someone inside the organization doesn't simply adopt an outside child (and if he's an inside child, that makes the latter true as well). So assuming latter, and the fact that so far we haven't heard about Amuro's parents at all(but we are aware of his childhood), we can conclude his parents are dead, and are likely killed by the BO. This connects the dots that they share a father.

5. This also explains why Shuichi and Sera's mother has consumed APTX. Their mother was possibly also an undercover and got her cover blown and was forced to consume APTX.

You might want to make a timeline that somehow explains when every specific event you describe took place, because this seems kinda disoriented like this.


Here is a possible timeline:
20+ years ago, Scotch and his wife (the father) joined the BO as an undercover, bringing Amuro along with him. This is based on Amuro's age and the fact that Elena was about to die. Shuichi and Sera probably was not raised near the BO.
6+ years ago, Scotch's cover was blown and was killed, possibly due to an FBI mistake. Scotch's wife was fed APTX and shrunk. This is based on the mother's age being that of a middle schooler.
5 years ago, Shuichi joined the BO to investigate his mother's shrinking. This is guessed from the fact that he was attempting to get contact with Sherry.
3 years ago, Shuichi's cover was blown. He and Sera went to the US.
1 year ago, Kir's father was killed. This is based on the fact that Kir joined the BO right before her father was killed, and she doesn't recognized Shuichi as a BO member, but rather as an FBI agent, meaning she joined after Shuichi quit.

Additional hint was the order in which Vermouth mentioned about the undercover agents in order they were discovered: Hondou, Akai, Scotch, from the most recently discovered to the earliest discovery. She didn't mention the mother though, which means the mother was probably not an agent. She could be a member of the BO that defected or simply a relative of a member of the BO.

7. And based on the fact that Sera's middle brother is a very good detective and knows about Conan when seeing Conan's picture, in addition to the assumptions above, we can guess that Amuro is the middle brother of the family.

Unlikely. You can see middle brother's hand in one of the panels, and it's pretty evident the skin tone doesn't resemble Amuro's

Spoiler:

It could be a disguise, as we see how Scar Akai, who is reality, Amuro, also has light skin.

8. Lastly, we can also guess that their father sacrificed himself on the job to save Shuichi during one of the missions, thus creating Amuro's hatred toward both Shuichi and the FBI, thinking that Shuichi caused their father's death and the FBI was too incompetent to protect their own men. This also explains Amuro being an undercover not from the FBI.

No such thing has ever been said about Akai's father, and no such FBI agent has been referenced or hinted at. Akai is considered such a big deal because it was an incredible feat for him to infiltrate the organization. If anyone and their mother (and father) could so easily do so, then this secret evil crime organization simply sucks.

Again, his father's death must have a function in the story. We do not know if his father works for the FBI or not, it's only a theory. It could also be that his father works for the Japanese Secret Police (Scotch worked for the JSP after all), and was killed due to a failed FBI operations. Remember Kir, both she and her father managed to infiltrate. Not every member of the BO is as smart as Gin or Vermouth. We've seen some really simple-minded higher ranked members such as Pisco, who left evidence inside a surveillance camera. The BO is so hard to take down because it has members from everywhere, including the police and the government. It is not secret because it is exclusive. We already see 5 undercovers so far, not a surprise to add a few more.

We could only guess that it happened right around the time the "father" was killed, which we can assume to be 5+ years ago.

Akai only infiltrated the organization 5 years prior to the series.

So that doesn't contradict anything. The reason I said was 5+ years is due to the mother's apparent age being middle school, which is 5 year+ a first grade elementary schooler like Haibara and Conan

The father is an undercover in the BO, is killed on duty, and is possibly an FBI agent.

Any evidence from the manga?

See the theories above

The middle brother is Amuro, who joins a police force not from the FBI, to spite the FBI and Shuichi, and is also an undercover in the BO.

Why would Amuro want to spite the FBI?

Possibly because the FBI caused Scotch's death. We see that he provoked the FBI agents by telling them to get out of Japan. An extension of this hatred is applied to Shuichi

My overall point is, you rely too much on guesses and assumptions. You should show some evidence from the manga.

Unlikely. You can see middle brother's hand in one of the panels, and it's pretty evident the skin tone doesn't resemble Amuro's

Spoiler:

Spoiler:

Was the panel with the middle brother's hand in the anime though? O_o *goes to check*
*returns* Yes it was! The middle brother not only has light skin but is right-handed and has a black (or dark blue maybe?) phone. Can't tell what type though... T_T But they could also be amibidextrous or something... *sigh* it's impossible to tell from just a single panel or a few seconds of a hand! But with the skin color it's definitely not Amuro! Or it could be that he was wearing a disguise at that time? But that's unlikely. . . and anyway from the Scarlet Series when Amuro was having a conversation with Akai it didn't give off anything that could mean they're siblings... it definitely isn't like the conversations my brothers and I have... T_T

After another look, the hand looks awfully like a child's hand. Maybe the unknown child is the middle brother? That will disapprove my theory if that's the case.

I'm not sure why there is a need for spoiler boxes here because it makes it hard for me to address the different points T.T I split your replies up to answer better, hope you don't mind.

Spoiler:

Not necessarily, Haibara only says that based on what she knows. However it appears that APTX is not developed by just herself so we couldn't be sure her statement is entirely reliable (plus she said that very early in the series, but Gosho at the time did not predict the series to be running for this long, so he probably made some minor mistakes in the statement). About the unknown child, we couldn't be sure about the time which the "mother" took APTX. We could only guess that it happened right around the time the "father" was killed, which we can assume to be 5+ years ago. This is supported by her apparent age to be that of a middle schooler. All known victims of APTX right now shrunk to the age of elementary school, so we can assume the unknown child too has shrunken to that age, but has since then grew up to age that of a middle schooler. We can guess from this that she probably has consumed APTX about 5 or 6 years ago prior to the story right now. That does fit the time frame in which Shuichi joined the organization, which is also 5 years ago

I agree about the Haibara and Gosho point, which is why I didn't say that the mysterious child being the mother is impossible. All I said was that if the child was the Akai family mother, it would have to have happened quite some time ago such that Haibara does not know about it. Regarding the time frame of the Akai family, I believe Kor has explained the problem already (father dying 5+ years ago but Shuichi only infiltrating 5 years ago).

You are not addressing my main point. Whether or not the mysterious child is actually the mother is not an issue. Since your theory holds that the mysterious child is the mother, I can make the assumption that it is true here. My main point is that if the mother shrank quite some time ago, while Amuro is young enough that he is still living with his family and hence knows about the possibility of shrinking, how is it that he doesn't consider the possibility that Conan is someone who shrunk too? In fact, from the recent chapters, it doesn't seem like Amuro knows that it is possible to de-age at all.

We don't know if Amuro suspects that Conan has shrunken. I guess he knows, and that's why he's investigating Conan. What he doesn't know is, who Conan was before he has shrunken.

Spoiler:

We do have an example of family infiltration in case of Kir though. She and her father both worked undercover at the same time, so this is not entirely impossible. Another possible explanation is that, maybe Amuro and Shuichi's parents did indeed work for the BO for real, but this explanation contradicts with Shuichi joining the BO as an undercover.

Kir's family situation is different. It's not explicitly stated, but it appears that Kir and her father pretended to be unrelated in the organisation (File 604). This is not possible for Akai Shuichi if he is really Amuro's brother. Amuro probably grew up in the Org, so according to this theory, it is likely that the BO would know the entire Akai family and their actual relationship with each other. They can't pretend to be unrelated. Also your theory would imply that Shuichi grew up in the BO, somehow managed to escape it, join the FBI, and then appear to re-join the BO as a random new member that no one recognises, which is... highly implausible.

It's possible that Shuichi and Sera were brought up separately from Amuro, and were not close to the BO.

As a side note, if they were brothers, it is unlikely that Shuichi would have to investigate so much to figure out that Amuro is actually Furuya Rei, even with a surname change.

If they were brought up separately, they might know each other's existence but not details.

Spoiler:

Amuro is known to spend a lot of time investigating Conan. Sera is a source of information. So I don't think Amuro would be too busy for other stuff. He is busy with investigating Conan, therefore getting information from Sera constantly can be explained. As for why he is able to communicate freely, I think this is due to he having some vital information about Vermouth's relationship with the Boss. We already see that he can quite freely do his own investigations without much interference from the BO. In Kir's case, I believe she is not as much an important asset as Amuro, and she was a undercover suspect, so she is probably under supervision with the organization constantly.

Amuro's priority has always been Akai Shuichi. And Sera normally texts her older brother to ask him for help with cases. The middle brother didn't even know that Sera knew Conan until that page that Kor put in spoilers earlier so it's unlikely that the middle brother texts Sera for the information he can get on Conan. You're right that Amuro does his own thing most of the time, but his personal investigation includes being around Vermouth a lot. From Amuro's POV, Vermouth is related to Anokata and he doesn't know Vermouth's soft spot for Conan = Vermouth is very dangerous to do anti-BO stuff around and he has to be careful.

[Kor]

Chekhov made a decent timeline for the Akai family (obviously some stuff are still vague). How about looking at it and see if your theory works with it?

http://www.detectiveconanworld.com/foru ... /?p=302982

We don't know how the father looks like. The only information to the father we can guess right now is that his code name is Scotch. Skin tune doesn't work like chocolate. It's related to the expression of the genes. We know the mother has light skin at least, and there are cases where one of the parents has dark skin and one has light skin but children have either dark skin or light skin. As for the hand, it could be it was under a disguise, as we see Scar Akai is light skin (but he is Amuro in disguise, who has dark skin. Gosho could intentionally make it so it doesn't give away too much about the middle brother)

I redirect you to my point earlier about Scotch. He was claimed to be from the Secret Police, so your theory that he is Akai's and Amuro's dad and also an FBI agent doesn't work. And again, your timeline is wonky.
Your scenario regarding middle bro's hand is cruel at best. There is no reason for Gosho to intentionally misdirect us to that extent (especially when Amuro stopped using the Scar Akai costume after the events of Mystery Train). While this series is notorious at this point for all of the disguises, we can't be expected to think that middle brother is wearing a disguise while texting his phone.

Unlike in the Western culture, where darker skin is considered more beautiful and healthy,

Based on what exactly are you saying that?

I don't see why it's unreasonable

It's not totally unreasonable for there to be more undercover agents in the BO. It'd just be really really tiresome and redundant.

Plus Scotch's identity is still unknown, so it is possible the father is Scotch. The mother might be a member of the BO, but defected later.

It's contradicting what you said earlier, though, about the father being an FBI agent.

Based on Shuichi's mission. When he first joined, he investigated Amuro. If he didn't know about Amuro's existence he wouldn't investigate him. Amuro is a very careful person. In order to know about his existence would require people of Conan's caliber. Shuichi didn't know Amuro was also an undercover, so he must know him via some other means. FBI didn't know about Amuro's existence until Kir told them about the codename bourbon. All evidences points to Shuichi knowing Amuro on a personal level.

When was it said that Akai investigated Amuro when he joined?

Shuichi and Amuro mourn the same person, that's also a fact.

Mourn is a pretty strong word considering what we've seen Akai do so far. He's been more sad about Akemi than this Scotch character who definitely wasn't even conceived when Akai first appeared.

And here is an additional fact, Detective Conan is a fiction, and a commercial fiction as well (meaning things that get published will always have a function in the story).

Not that I doubt Akai's dead father will serve some sort of function (though I don't think it will be a major one), but if everything that gets published has some function in the story, what exactly is the function of the 900+ random suspects and 250+ culprits that we've seen so far, beyond being just a tri-weekly "culprit/suspects of the day"? Many cases and characters in DC don't progress the story at all.
Also, that's not what commercial fiction means. Commercial fiction at its core is "Fiction written to appeal to as broad-based a readership as possible."

With that said, the first theory we can come up with is that, the person Shuichi mourns is his father.

Sorry to go back to rhetorics, but what's the deal with the constant "we can"? The one who's been doing these theories here is you. What's with the plural stuff?
Also, just because it's the first theory you can come up with, doesn't mean it's correct.

This is the logical step and doesn't involve any guessing

Well, yeah, no guessing there, but it does rely on the guess that Akai and Amuro mourn over Akai's father.

Amuro has been brought up inside the BO.

That's something that has not been confirmed as of yet. We know he knew Elena, but we can't be 100% sure that he's been brought up there. Not that I'm saying he wasn't, but just pointing out the element of uncertainty here.

20+ years ago, Scotch and his wife (the father) joined the BO as an undercover, bringing Amuro along with him. This is based on Amuro's age and the fact that Elena was about to die. Shuichi and Sera probably was not raised near the BO.

20+ years ago, Sera wasn't even born. She's been raised in Japan. If the parents are in the organization, who raised her?
Plus, if Scotch had been there for so many years, then why doesn't the BO know his name?
Why would the parents take Amuro with them to the organization? Why would the BO trust Amuro if his father and mother turned out to be an undercover agent?

6+ years ago, Scotch's cover was blown and was killed, possibly due to an FBI mistake. Scotch's wife was fed APTX and shrunk. This is based on the mother's age being that of a middle schooler.

Then why does Amuro have such a hatred for Akai in particular? Akai wasn't in yet, so what makes him responsible for Scotch's death?

5 years ago, Shuichi joined the BO to investigate his mother's shrinking. This is guessed from the fact that he was attempting to get contact with Sherry.

Shuichi's role was to investigate the organization and build his way up to the executives and get to the boss. Sherry was never the prime target. You're ignoring the fact he had a duty as an FBI agent.

3 years ago, Shuichi's cover was blown. He and Sera went to the US.

Akai was kicked out 2 years prior to the beginning of the series.

It could be a disguise, as we see how Scar Akai, who is reality, Amuro, also has light skin.

Why would Amuro disguise as someone at that point? Beyond fooling the readers, what exactly would have been the point of having Amuro disguise as someone while texting Sera? This line of thinking feels a bit meta.

Again, his father's death must have a function in the story.

The said function doesn't have to be the one you suggest, though.

Also, familial relations and what-not, this agency hopping is very puzzling. You have to follow certain requirements to get into the FBI, and most likely Secret Police too. If Akai's father and/or mother infiltrated the BO, letting Akai do the same, sounds pretty risky to the FBI (emotional attachments and/or resemblance, etc.). It requires some super coincidence that one family participates in two national organizations, and the said people of the family all manage to infiltrate this secret evil crime organization. It's very convoluted, as well.

We already see 5 undercovers so far, not a surprise to add a few more.

It would be redundant and would undermine the competency and threat of the BO even farther.

Possibly because the FBI caused Scotch's death. We see that he provoked the FBI agents by telling them to get out of Japan. An extension of this hatred is applied to Shuichi

No, this completely contradicts all of what we know of the dynamics between Akai and Amuro. Amuro was super obsessed with Akai, and Gin even said Bourbon hates Akai more than he does. Claiming that his hatred for Akai is just an extension to his hatred to the FBI doesn't make sense.

Moreover, why didn't Amuro reveal to the BO back then (when both he and Akai were at the organization) that Akai is with the FBI? it's been established Amuro wanted to hand him over to build a name for himself, so why didn't he do that back then? If Amuro knew Akai as a brother, and knew he was FBI, then why didn't he do that?

Heck, why did he even appear as Scar Akai in front of Sera, instead of just calling his sister and ask if she knows if Akai is dead, or something like that? (file 801)

EDIT: Also, please refrain from double or triple posting.

[jimmy_kud0_tv2]

Timeline of events that we have been told about according to various places on the Detective Conan World Wiki.

The only thing unsure is Shuuichi's real age. Considering that he dated both Akemi (age 25 at beginning of the series) and Jodie (age 28) I want to say that his age is really close to one of their ages but also in between their ages. Shuuichi gives his disguise Okiya Subaru's age to be 27, and the character that Shuuichi is based on (Char Aznable of Mobile Suit Gundam) appears in the first two Gundam series' at the ages of 20 (Gundam) and 27 (Zeta Gundam).... I want to say that Shuuichi is 27 years old. However with the reveal that the middle brother's friends are 28-29 years old the middle brother could be anywhere between the ages 27-30, but this confuses the timeline with Shuuichi's possible age. Its also possible that the middle brother may only be younger than Shuuichi by about year, which would put Shuuichi at age 27-28 and the middle brother at 27.

30 years ago - Miyano Atsushi moves out of his father's house to go research somewhere (supposedly BO)
29 years ago - Furuya Rei is born
28 years ago - Haneda Shuukichi is born (put here because some people think he is the middle brother or plot important)
27-28 years ago - Akai Shuuichi's approximate birth based on the above, Hondou Hidemi is born
26
25 years ago - Miyano Akemi is born
24-25 years ago - Rei (aprox age 4-5) is healed by Miyano Elena and she say that she is going far away
23
22
21
20 years ago - Miyano Atsushi, Elena, and Akemi (age 5) visit Atsushi's old home in Japan
19
18 years ago - Miyano Shiho's approximate birth
17 years ago - Akai Masumi is born (Sera Masumi), Eisuke Hondou is born
16
15
14-15 years ago - Masumi and the middle brother begin using the family name Sera, the middle brother enters high school
13 years ago - Hondou Ethan and Eisuke live in Osaka and visit a restaurant where Ethan is photographed
12
11-12 years ago - Middle brother graduates high school and changes family name, all three siblings have different ones.
10 years ago - Supposedly the time period when Hidemi (age 17 aprox) cut ties with her family and disappeared.
09
08
07
06-07 years ago - Shiho's aprox age 11, the earliest of Elena's tapes that still had a recording was tape "11 to 15"
05 years ago - Shuuichi infiltrates the BO as "Moroboshi Dai" and starts dating Miyano Akemi
04 years ago - Shiho's aprox age 13 returns from America where she went to school and enters BO as Sherry
03 years ago - Masumi (age 14) and her mother move from Japan to America
02-05 years ago - Sometime while in the BO, Akai (Rye) interacts with Bourbon and Scotch and Scotch is outed and killed
02 years ago - While working under Gin, Shuuichi is outed as an FBI agent and removed from the BO
01 year ago - Akemi returns to hide Elena's tapes in Atsushi's old house, Shuuichi is in New York chasing Vermouth, Shiho accidentally sends Akemi a floppy with APTX data on it, Shiho completes current version of APTX

00 - SERIES START
- Shinichi becomes Conan via Gin and Vodka
- Shiho escapes the BO and joins Conan's side as Haibara
- FBI chases Vermouth to Japan
- Conan discovers Hidemi Hondou (Kir) is CIA
- Akai Shuuichi fakes his death and becomes Okiya Subaru
- Through Kir, Conan learns of Bourbon
- Masumi returns to Japan, telling people that her mother is still in America.
- Mystery Train arc makes BO think that Shiho is dead (except Vermouth)
- Amuro Touru = Bourbon
- Shiho's age aprox 18, Elena's tape 18 revels info of the project known as "Silver Bullet"
- Furuya Rei = Amuro Touru = Bourbon
- Reveal that Rei hates Shuuichi for being the cause or reason that Scotch died
01 -
02 - Shiho's age aprox 20, Elena's tapes go until Shiho is age 20

[Kor]

ALSO, approximately one year has passed since the beginning of the series so any ones ages who we learned about in the first 20 volumes or so have almost aged by one year at this point.

Pretty sure that's incorrect.

Spoiler:

"even though not even a year has passed since then..."

[jimmy_kud0_tv2]

ALSO, approximately one year has passed since the beginning of the series so any ones ages who we learned about in the first 20 volumes or so have almost aged by one year at this point.

Pretty sure that's incorrect.

Spoiler:

"even though not even a year has passed since then..."

corrected the things that would be effected by that mistake above.

[Shiromi]

*reads the theory*

Jahithber, could you pleeease pretty pleeease use the quotation boxes? It's so confusing when you put your responses in the text you're responding to.

There are a lot of reasons that this theory is implausible, but the reason that really sticks out for me is the few interactions we've seen between Bourbon and Akai.

They hate eachother, and not in a brotherly way. They don't seem to know eachother personally. If they had, they would have known that the other was an agent for the FBI and the Japanese secret police. Akai wouldn't have had to research to find out Bourbon's identity and that he is part of the Japanese Secret Police:

Also, this Scotch person was close to Bourbon, but while Akai regrets what happened to him, it doesn't appear that Akai was particularly close to him. Bourbon takes his death a lot more personally than Akai does. If Scotch was their father, I doubt Akai would have done whatever he did that got Scotch exposed and killed. Also, he would mourn Scotch's death, as opposed to simply regretting it. Look at Bourbon's response to the mere mention of Scotch:

And look at Akai talking about their relationship, and by extent, what happened to Scotch:

He seems kinda surprised that Bourbon took the death so badly, which he would not do if they were family.

Furthermore, if Bourbon was raised in the BO like Sherry was and has turned double-agent - why would Akai have to make up the identity Moroboshi Dai and date Miyano Akemi to get in? He could just use his brother - no, he'd already be in, because the BO makes whole families when it recruits people. That'd make Sera someone raised in the organization as well, and she'd recognize Bourbon.

This Akai Family theory holds as much weight as cheese cloth holds water.

[jahithber]

*reads the theory*

Jahithber, could you pleeease pretty pleeease use the quotation boxes? It's so confusing when you put your responses in the text you're responding to.

There are a lot of reasons that this theory is implausible, but the reason that really sticks out for me is the few interactions we've seen between Bourbon and Akai.

They hate eachother, and not in a brotherly way. They don't seem to know eachother personally. If they had, they would have known that the other was an agent for the FBI and the Japanese secret police. Akai wouldn't have had to research to find out Bourbon's identity and that he is part of the Japanese Secret Police:

Also, this Scotch person was close to Bourbon, but while Akai regrets what happened to him, it doesn't appear that Akai was particularly close to him. Bourbon takes his death a lot more personally than Akai does. If Scotch was their father, I doubt Akai would have done whatever he did that got Scotch exposed and killed. Also, he would mourn Scotch's death, as opposed to simply regretting it. Look at Bourbon's response to the mere mention of Scotch:

And look at Akai talking about their relationship, and by extent, what happened to Scotch:

He seems kinda surprised that Bourbon took the death so badly, which he would not do if they were family.

Furthermore, if Bourbon was raised in the BO like Sherry was and has turned double-agent - why would Akai have to make up the identity Moroboshi Dai and date Miyano Akemi to get in? He could just use his brother - no, he'd already be in, because the BO makes whole families when it recruits people. That'd make Sera someone raised in the organization as well, and she'd recognize Bourbon.

This Akai Family theory holds as much weight as cheese cloth holds water.

Something to consider is that, Scotch is known to be a member of Japanese Secret Police (JSP), and Amuro also seems to be one.
We know that Amuro was raised inside the BO as a child, and he obviously couldn't join the JSP at the young age. This poses a few questions:

1. Why was he raised inside the BO and who is his parent(s)/guardian? Presumably whoever takes care of him is also inside the BO, either as an undercover or as a true member.

2. But why did he specifically join the JSP when he grew up and why he works as an BO undercover? He must have some grudge against the BO, and the source of the grudge is likely the death of Scotch.

Base on some facts, we can guess a few things:
Amuro's parent/guardian is not a member of BO because Amuro himself wants the BO gone. And this of course means the opposite, that his parent/guardian is an undercover.
Amuro joins the JSP and become an undercover in the BO because of Scotch. And this naturally implies that Scotch was his parent/guardian when he was young.

So at least I think you can agree with this.

As for your comments on the relationship between Shuichi and Amuro, Shuichi and Sera might not have grown up with the father, and were raised separately by the mother. Amuro on the other hand was raised by his father inside the BO, while the father was working in the BO as an undercover.

That would explain why Shuichi was sad about the father's death, but not as sad as Amuro, because Shuichi was not close to the father unlike Amuro, who was raised by the father.

On the other hand, so far not many people know about Conan's deduction prowess. A few I can list are:
Shuichi(Okiya), who is of course the bigger brother, and Sera, who is the little sister.
Agasa, Haibara and Conan's parents, who do not match the middle brother's age or gender, and don't have a reason to hide from him.
Jodie, Takagi, Sato, who I do not believe to be the middle brother based on the story so far.
Kid, which comes from the Kaito family, so he cannot be the middle brother.
Heiji, who is from the Hattori family, so he cannot be the middle brother.
Vermouth, who cannot be the brother due to her gender
Eisuke, who comes from the Hondou family, so he cannot be the middle brother.
Shukichi, who is known to the public, thus will not fit Sera's description of the middle brother, who is supposed to be in a covet mission.
Then a few dead people like Akemi, and a few movie only characters, which are not canon.

This leaves Amuro, who fits all the descriptions of the middle brother.

Here's a the descriptions on wiki

He does not look like Shuichi Akai or Masumi Sera, who presumably resemble their mother. The middle brother looks more like their father.[1]
Amuro doens't look like Shuichi or Sera
The middle brother is older than Masumi, but younger than Shuichi.[1] Neither of their ages have been revealed, but Masumi attends class with Ran and Shinichi who are 16-17, and Subaru Okiya claims to be 27. The brother's former high school classmates are currently 28 and 29 years old, suggesting that the brother is probably similarly aged. Although if that were the case, then Akai would be older than 27.
Based on the timeline given by jimmy_kud0_tv2 above (which is a close approximation based on the facts known), Amuro's age also fits this description
He is apparently in the middle of an important job and won't tell Masumi where he is.[1]
He is an undercover inside the BO, so he cannot tell Sera where he is or what he's doing.
He is very intelligent; note that Sera characterizes the already intelligent Akai as "strong" in contrast to the middle brother. He advises Masumi on cases via cellphone.[1] He was able to correctly deduce over the phone that Masumi's deduction was unreliable in a bathroom murder case. Masumi says that his high school friends report that he solved puzzles and mysteries very easily.[2]
Amuro is shown to be on par with Conan in terms of deduction prowess.
In one panel, we see the middle brother responding to Masumi's message using his right hand and a black cellphone. Unless the brother is disguised, this would imply he has light skin. The use of the phone with the right hand is not an absolute indicator of handedness because sometimes characters with known handedness will use phones with their off hands.[3]
Amuro is often in disguise as we see him as Scarred Akai. So this cannot disproof the theory.
The middle brother recognizes Conan and knows he is a good detective.[3] After an exchange of information regarding deductions, the brother asked Masumi who she was referring to. Masumi shows the brother Conan's picture thinking he will be surprised. The brother replies back that "if it's him, then there's no problem". Masumi is very surprised and wonders how her brother knows Conan. Her suspicion makes sense because Conan didn't exist prior to Shinichi shrinking.[4] The brother later sends another text to Masumi, which makes Masumi react "Ah, I see. So that's how it is."[5]
Amuro already knows Conan is a good detective, and suspect him to be Shuichi (He even paid a visit to his house in the delivery truck case).
While the middle brother is not a detective himself, his intelligence seems to be well-known among the students from his high school, as he apparently has solved some mysteries in his class during his time studying there.[2]
This is referring to the middle brother while he was in high school. Since Sera doesn't know what he's doing right now, we can only say, this statement cannot disproof the theory. We didn't know much about Amuro's high school life but we can assume he couldn't be too flashing growing up inside the BO.
According to Masumi, the middle brother's surname had been "Sera", which he got from his mother's side, until he graduated from high school. His current surname in the present timeline is presumably something else.[2]
Not much to say about this one. Amuro's current name is Furuya, and not Sera, so this statement fits

And in addition, Gosho also gave a hint here. Shuichi's name comes from Char Aznable. Sera's name comes from Sayla Mass. And lastly Amuro's name of course comes from Amuro Ray. Char's little sister is Sayla. And Sayla and Amuro are a couple. And Char and Amuro are rivals and very close friends. These three people hint that Shuichi, Sera, Amuo are also connected somehow. The relationships between Shuichi and Amuro, and Shuichi and Sera have already been revealed. The relationship between Sera and Amuro has not been shown yet, but should definitely be there.