I was an unfavored child -- raised by an evil stepmother. However, I am now the most successful of all of my siblings.
My adivce -- do what I did. MOVE OUT, GO ON YOUR OWN, and HAVE NOTHING TO DO WITH YOUR FAMILY.
I totally divorced my family. Three years later, they were all OH, please come and visit. And once I had children it was: OH please send pictures of the granchildren. I said, you should have thought of the future when you were bad to me back then. That nearly killed my stepmother.
She has now repented and admitted that she was bad and SHE is trying to repair the relationship, but it took THIRTY (30) years.