Robin shoots back the standard 'anything for my angel' look that is also a 'you're welcome'.

And Billy? God he's just caught up watching this charming family interaction with warmest smile imaginable on his face. A look that is half affection, half longing. He'd love a family like that.

"Yep. But now I gotta go play with my own family and your dad says he wants to let me borrow keys to the castle. What do you think, Lizzie. Is that a good idea or a bad idea?"