After posting I reread your post and realized you said the dcb is 2 well in that instance he may not be that able to tell you what he likes to do with his daddy himself. For my son (who is 2and a half)when he doesn't want to leave a place we give him some extra time to let it sink in that he needs to leave by asking him to say bye to specific things like bye train that he was playing with, then by puppy that is nearby, then bye such and such so basically not just pushing him away to leave but also letting him know he does have to go. That or I might ask the grizzly dad what does he and his kid enjoy doing and maybe encourage him to mention that to pursuade kid to come. For my son we would say hey let's go play trains at home.