I am totally up for Any of Shou's relatives ending up being another reincarnated. He has a slew of relatives in the States thanks to his mother's side of the family, while his father has only one other sibling.

Both of his parents I have a good idea what they're like with his father being in finances and his mother a pianist. They meet in college while she was an exchange student and ended up totally falling for each other. For Shou's siblings, he has an older sister and a younger brother, both of whom are a bit more responsible than him. There are a couple cousins on his father's side with both being in college so maybe a transfer student or something? Anyways, anyone that Shou knows from school would be in the upper middle class or higher because kids with money tend to hang out together than kids without, though Shou's best friend is a kid from the wrong side of the tracks who totally gets Shou.

On his mother side, there are a whole slew of aunts, uncles and cousins. The uncle he works for is a small claims lawyer who has his own little office. His wife is a teacher in grade school so maybe Shou has been seen there picking her up in his fancy sports car. They're a hard working middle class family with a couple kids of their own - probably teens. His other cousins range in age with the oldest I think being about three years older than Shou and the rest range from young teens to college. His mother had two sisters and a brother and the brother is the one Shou's working for.

Shou himself has had a lot of dating going on in his life. He started figuring out girls at the tender age of twelve, though he doesn't stick with just one woman at all. He has had maybe four serious relationships with one almost hitting marriage but something made him stop the engagement before going back to his fun. There hasn't been anything serious with guys, though he has messed around.

I think that's it unless something more comes up.