He became addicted to the gameGalaxy of Death 2, and all he does basically for a whole week. He also always has mints and a lot of times gives them to people saying, "Have a mint." He is mentioned by Gabe as crazy while he is hiding from his grandfather. Bob replies, "One more thing him and Grandma have in common," because she locked him in a room. Later, PJ agrees with them when she makes him go in the room after he becomes slippery with sunburn ointment.
It is revealed in "It's a Charlie Duncan Thanksgiving" that the Duncan kids like Hank a lot more than their other grandfather Frank.