Well, Rei has a noble father who she had a falling out with, and when she was a kid it's possible they met. She's not super...sociable? But she's a newbie trainer who'd probably listen to him if he had advice.

I could also *possibly* go along with an arranged marriage from her father, waaaay down the line. I wouldn't, ideally, like it to go into full on romance, but a "we don't wanna" sort of thing I think might could be fun?