"This crazy-ass mother of yours, can't live with her, can't live without her. And damned if she doesn't feel the same about me," How does this quote define their relationship? How does this explain why Jeannette's father comes back?

Rex and Rose Mary are like two sides of a coin. They fight, and they argue, but in the end.... they're equally immature and self-centered.... they're equally dysfunctional. None-the-less, they like the craziness, and in the end, I guess they love each other.