"Adults don't have to claim not being children anymore. As long as they keep that up, they're still your little boys."
Tywin wasn't very close with his nephews which wasn't that big of a surprise, considering his dysfunctional relationship with his own children. Ha! His PA was closer to him than the twins and the little one were.
"Bring them along. They might learn something about how to properly enjoy being boys. If not, they'll at least go home with a healthy tan."