Advice please...my family is insane. ?

First of all be thankful you still have your dad and he still cares. As for your mom and your brother- you tried and that's all you can do. You have told them that through all this you still love them and they still chose to act like that. I know it hurts like hell but you are the mature one who overcame what seems to be a not very good life. Most people cave in and choose carry this burden. As for the bad relationship- a lot of girls go through that. Just be thankful that you got out before the inevitable happened. Your dad knows what you are going through so if it were me I would talk to him about your feelings. Sometimes it just helps to talk about it. good luck to ya