No one wants their parents to behave this way, but they do. It sucks, but the reality of it one day you'll be an adult who supports herself and you'll be able to leave them behind. Until then, stick with the parent that you feel safest/supported by. For me it was clearly my mom. No kid should have to pick between parents because no matter how stupid they act, parts of you will love them both no matter what. Think selfishly and do what's best for you though, your parents' problem isn't related to you and there isn't anything you could do for their relationship.