I had much the same experience with my dad. I decided one day to do my daughterly duty, because I loved him. I did not love the way he treated me and continually put me down, but he was the only dad I had and I did not want to wait too late to at least make it right to myself. Your first priority is to protect yourself from abuse and pain, but sometimes putting up with the aging parent is worth it in the end. My dad passed away in Dec. and I feel myself healing from all the bad things. I do not advise anyone to do as I did, rather, I advise you to do what feels right to you.