Do you think I could act bratty towards my dad about his family?
Why do you want to act bratty with your dad?
I do this to get back at him, because my father is far too soft when it comes to his family
You shouldn't disrespect your dad. He works hard to put a roof over your head.
He should have been more firm on his family.
You need to be less hard on your dad, because you're treating him as poorly as you're saying other people are. Kids are expected to treat their parents with respect.