It's wrong to want your parents to split up.
Max's father is always belittling his son.
Max wants his father to understand how his behavior affects him.
Max's documents all the mean things his father says to him over the course of a day and shows him.
Max tells his mom she'd be better off with someone else right in front of his father.
Max's father agrees to talk about his behavior with a therapist.
Max's father lashes out at his son even more.