Heartbreaking story, I sympathise always with kids when parents go wierd. I have a daughter, we are close, her Mum and I split when she was only 5. She's realised neither of us is perfect but I would die for her rather than ever desert her. To me her life is more important than mine and always will be. I am about to hit my sixties and she is barely twenty, she's at Uni living away now but we chat every few days. I am unlikely to be finding a woman with young kids who might want to make a life with what might be left of mine, and am OK on my own anyhow, being an only child like my daughter is too.
I write what I write about in Medium mostly for a better world for her, though I hope to see some of the benefits also, I know I might not. We have to live in hope.
I hope your Dad will change his view sometime soon, though I guess it could never undo the damage done, at least it might stop hurting you so much.
Thanks for posting.