Maybe a spoiler about Ryoumas son?
Spoiler:So I didn't know you had to talk to Shiro to recruit him in his Paralogue. He died in the first turn, so I couldn't do so anyway. Well, the dialogue after the chapter implied that he was joining the party and I saved the game. But he doesn't join the party if he dies. So now I can't get him at all. :(((( So yeah, make sure you talk to Shiro asap if you want him.
Spoiler:
Yeah, if a kid start out as an Ally, typically you must talk to them with their respective dads to be recruited, unless there are some other requirements (e.g Asugi). Shiro's map does suck though. Past Chapter 18, you have to use a Rescue staff, because the chances of him surviving are non-existent.