If your family acted as if they didn’t want you or treated you like an outcast it would be best to disown them and move on with your life?

Pretty much what happened with me. Not that I want it to happen, yet when the final push happened I just didn't fight it. No point in doing so. Being a half sibling to all the rest just wasn't worth all the pain. None of them really accepted my father either. And what happened to our own mother was the saddest story of all. Everyone except me abandoned her. ;(