I was watching the "Empire of Dreams" thing and he and his wife split at the end of filming ROTJ, and he said that it "Left him to raise his daughter alone."
And then, I got thinking, "Wow, the husband of the family got custody over the kid. Normally it is always the mother that gets them." And then I thought, "wait, Lucas is rasing her alone? What, did his wife decided that she didn't want to even share custody, or even see her daughter anymore?"
Unless, all 3 of his kids are his own adoption, and that case I can understand that his ex-wife doesn't really have anything to do with them.
I know he takes good care of his kids. Hell, that one daughter of his is HUGE!