I would like to suggest that you are not your dad's doctor, priest, or counselor and you don't have to listen to him bubbler about how sorry he is. It sounds like he needs medical attention to me.
My parents wanted to force me into an adult role in our house hold of taking care of the younger kids, cooking, and laundry I resented the heck out of it. I was a kid and I wanted to be a kid. You have a right to enjoy your youth and not have to carry the burden of their guilt.