What does the drain-pipe incident show us about Art's relationship with his father?

The drain pipe incident shows that Art's relationship is difficult. He is annoyed at Vladek's insistence on trying to do it himself and he considers having to help Vladek a burden. He pushes the problem on someone else. Of course, he comes back later, because he feels guilty, which shows that he has some tenderness for his dad, even if it's conflicted with resentments too.