I JUST HAD A REVELATION!!! What if the reason Paul's so mean to Peter is because Peter was allowed to go and do his own thing and Paul had the stress and responsibility to become mayor? We see he's amazing with plants, maybe Paul wanted to become a botanist instead of Mayor, but he was expected to carry on the Perfect tradition?
Oooh this could perfectly be ! But instead of being literally forced by their parents, I woumd rather see himself feel obligated to do so and convince himself that's what he wanted and what is needed, hence why he has a grudge against all his younger siblings who could go out and do what they wanted while even if nobody forced him to decided to stay out of family tradition and limiting himself. Because indeed Paul is a perfectionist (no pun intended) and needs order in his own little world, so he would not want the town made by his ancestors to be led by politicians outside the family, and HE must ensure for it to remain the most perfect town in America even if it means being despotic, because he is all for tradition and strict and standards, both forbidding himself things but then forbidding things to others too because he takes his role seriously. Mayor of Perfectville ? Then HE will be the most perfect mayor. And wants to mark the history of town to show how dedicated he was to that town because HE takes his responsibilities and family tradition first, RIGHT ? RIGHT ? PLEASE TELL HIM THAT
I also think he is just jealous of all his younger siblings for existing because he would have preferred less responsibilities and be pampered as an only child, but maybe Peter in particular because he DARES bearing their father's name instead of HIM, being the youngest he was pampered the most and the most carefree to have nobody to babysit even if it meant to cancel plans, and since he turnt out to be a famous racer like their father and is seen everywhere on TV, magazines etc doing what HE LOVES, that must have also been enraging. He bullied them all as kids but he did the most on him, and as we saw would always remind him of a loser he was whenever he was home. Out of jealousy
Dunno if a botanist though, maybe just take care of the family's farm all peacefully would have been his thing
















