One of the big questions of isekai stories: should the reincarnated person act as an adult or a child??
1. Have the mc think as an adult all the time. ( mc may need to pretend to be a child to hide the fact ). Can come off as creepy (e.g. in Mushoku Tensei)
2 Only memories are transferred but...
ok so ML will have a wife who has saved a lot of sick people ( definitely FL) but also has a sister who cares for him ( also probably FL?? ). Not sure if they are supposed to be different