@SandMason 
I hope you get the support and validation you need from your therapist.
Isn't it amazing what our brains can recall when we let them go to those places?
I was abused by my father, I witnessed him abusing my older sisters too, all done in a jokey, tickly way.
I had never discussed it with any of my sister's throughout the years. He and my mum split up so I had limited contact with him.
It wasn't until family circumstances in later years he came into my life again.
When it became clear to me he hadn't changed, I spoke to my sisters. We were all relieved it was out in the open.
We disclosed the abuse to our brothers and although they wanted to report the abuse to the police, we couldn't have coped with it at all.
My brother confronted him, he denied it and then said he didn't remember, but he drank a lot in those days and it was probably because of that.... 
We cut contact that day, all of us. He has nobody. If I ever feel sad/guilt/worried I remind myself of all the incidents that he got off with over the years, he really should rot in hell.
Meanwhile one of my sister's has an eating disorder, the other has OCD and another is an alcoholic.
I have had counselling, psychotherapy to be precise, but I know his legacy will live with me for a long time.
I feel so much for you, but well done on cutting contact, I hope it helps.
He doesn't deserve room in your head 
