Sometimes he joins in with the other two and they all help,
Here they are helping with the Grandbrat,
He is totally infatuated with her and while being an over-excited douchebag at times, he is surprisingly gentle with her. In fact he doesn't even kiss her, he licks the air just in front of her face.
I think once she gets up and running they are going to destroy the house. Might be fun to watch.