I’ve got a theory on this that I haven’t seen anyone else propose yet.
Part of this may be my naivete. I thought Phyllis was a nanny, and divorce didn’t even enter my head. If the father is busy all the time, chances are he makes a lot of money, and if he makes a lot of money, he probably has some sort of permanent caretaker, who made the comment more in anger at her employer than at the child.
Now this is where I get a bit creative: Who was the only real well-to-do guy we ever saw on screen? Who would have been in the area so that when he stops paying attention to his kid, the kid could easily end up at Carl’s house? Who, really, is the most poetic candidate for Russell’s father to be?
He wasn’t named, but that executive-looking guy that wanted to kick Carl out of his house… in my head, he was Russell’s dad: a serious, no-nonsense, unemotional statue of a father figure that Russel could never hope to relate to. A man who wouldn’t be interested in Wilderness Explorers in the slightest, and not understand the importance of the club for a kid. A man who would give his son a GPS as a toy.
Most people consider Muntz the main villain in the movie. I personally found him to be rather pitiable. The guy was (wrongly) made into a mockery, and has spent literally the rest of his life trying to bring honor back to his name. He was an obstacle, but he wasn’t a villain.
I like my theory because it makes Russell’s dad into the true villain. He started out with a position of power over the both of the main characters, each in a different way. but through the course of the movie, they both managed to grow, and managed to get away from this influence. Carl came to terms with Ellie, so he doesn’t need the house that was so threatened by the man, and Russell found a new father figure in Carl, so he doesn’t have to depend on his poor excuse for a real father.
Assuming I’m right, I don’t think there would have been a good place to really mention this in the movie without being camp or obnoxious. But I was really hoping for some kind of confirmation of my theory. Oh well, I’ll have to be satisfied with keeping it in my head or waiting for some kind of director commentary.