Once Betty figures out how to repair Simon's memory, Finn might get her help to fix his Dads. Once he realizes his Dad has a messed up noggin and isn't just being a complete asshole.

I'm sure something else happened to Martin that we haven't seen yet. The fact Finn and his mom were never shown discussing him meant they aren't ready to deal with that story yet. Martin will have a much bigger role to play towards the ending, as this show has a running theme about Fathers.

I think you mean Adam Muto. He's the real brains behind this incarnation of Adventure Time. Penn Ward just wanted to do silly shit each episode. The last episode he wrote was about Tree Trunks sex life. That's all he cares about. Well not Tree Trunks sex life, he just likes the abstract not connected to any on…