SO FIRST OF ALL I think that his daughter and Rei's daughter should 100% be friends :D
Second, I have Stella and Jun in his age group (and even people like Oliver and...others, but I can't remember ages off the top of my head lmao) if you want friends and things!
I love, love, love seeing these Firefly people omg ♥ I started a rewatch but I'm doing VM and OUAT at the same time, so lololol