I never realised there was a name that explained my DF.. or not so dear.
My earliest memory is of being tormented by him (teased til I cried) aged 3. He never used my name..called me 'the worm'
As I got older he mostly ignored me unless I was around when he came home from the pub, when he was very nasty indeed...made every opportunity to humiliate me in front of friends. He also hit me and Mum (once blacked her eye because one of his work colleagues had popped round and Mum and colleague were discussing classical music.. he felt ignored) He told me I'd fail my A levels, (I didn't..top grades) I'd fail University (got a better degree than his) and warned my DH not to marry me as I was pointless. My Mum finally got the courage to leave him when I was 17 after one of his many affairs.
I stuck it out.. right into my early 40s. But by then MY kids were teens and had noticed that Grandad..who we saw rarely, always belittled me. THEN he started on DD1 who had just done GCSEs and knew she wanted to be a doctor.
He told her her A level subjects were wrong (they weren't) that she'd never get to Med school as she went to a crap school and she wasn't clever enough.
I finally saw red. Finally got the courage to tell him that if he EVER spoke to her like that again he would never see any of his grandchildren again. He did the sob story to my brother.. (golden child, but lovely) who told him he needed to apologise. When he rang to say ' why are you so mean to me' I gave him 44 years worth of how he made me feel and how he was never going to do it again.
It was so cathartic. AND with the aid of his 3rd and final wonderful wife, he did reel it in a LOT. Never spoke to my kids again that way and his wife came down on him like a ton of bricks every time he even tried to put me down.
Sadly she died 3 years ago.,,and he became very ill just after. Somehow I found myself driving 120 miles to his home every weekend to take care of him. And somehow..as adults.. we finally had a relationship. He'd still start after a few drinks (he was a functional alcoholic always) but I'd just tell him to shut up and put him to bed 
He died very suddenly, but the last thing he said to me the weekend before was 'I love you' and despite everything.... I think he did. And that helped somehow to repair the very deep seated damage in me. I will never feel 'good enough' but I feel stronger.
Oh and DD1 is now a doctor ... he died before she qualified this summer but he was very proud of her!
Christ that was long, sorry! But I have never said how he made me feel.. how bad my childhood was... and I now know that he was a deeply damaged man himself. This is an amazing thread.. terrible but also uplifting because we are all survivors one way or another...