This is my personal opinion.--
I would go see the family for the holidays. I would look for my Dad. I would tell him how I felt about his abuse. I would wait to hear if he had anything to say about it, apologize.

Then I would say I loved him and wished him well but that I would not be seeing him again.

That way I would feel that I said my piece,cleared my conscience and could hopefully leave the pain and move on with my life.