What I particularly like about this is I think this is the first time Question Hound has legitimately smiled in FOA. This indicates one of the few things that still gives him joy is the hijinks of his nephews, whom, despite perhaps being somewhat rude and selfish, he still loves. They're family, after all. He might not know which family but family is family.
this is probably a deeper reflection on the dynamics than intended and i don't expect the nephews to appear beyond this one visit but i still like thinking of it this way