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?

I was my parent's only biological child and I was pushed to the side in favor of the child they adopted. They claimed they loved me equally but never showed it (I know that was for "appearances") they did whatever they HAD to do for me and nothing more, everything was all about him. Even when I got married...both times, my wife was favored over me. I only had one relative that I was ever close to and had connection with and that was my mother's mother (and she passed in 2005). My parents are both gone now and I have put them and all of the trying to establish and maintain a relationship behind me. Their other son, my "brother", has nothing at all to do with me which doesn't hurt my feelings at all. I've washed my hands of my entire former family and I have no regrets.