It has been so long since Skulduggery even thought about parental approval that the comment briefly doesn't make sense to him, before he remembers, ah, right.

"I'm sorry that they won't know how happy you are here. Ah, but at least you've got Rich to pass that sentiment on to. Find him a nice partner or two to settle down with."

Hehehe. Like he isn't going to tease César a little!! Especially if he can potentially encourage someone to embarrass a teenager.