"I doubt it'd be exactly that, but they do get along. Rusty had something of a rough time at home, and he had to make a lot of adjustments to being here. But Peter helped, and he's a part of the family now." At least, they were both a part of Kitty's family, more or less, though she didn't think Cora would get there anytime soon.
"It was great meeting you, but I should get going. Maybe we can all have dinner sometime, or at least you, me, and Peter."