My mum. 13 years.
Reason was (mainly) emotional abuse that started when I was 3 and lasted until the last time I ever saw her when I was 37. It was constant. Not something that cropped up now and again.
Eg as a child, I was mocked and usually punished for expressing any emotion - if I was happy, she'd mock me to bring me down a peg or two; if I was sad, she'd mock and humiliate me for crying. She often goaded me into anger and would then talk about getting child psychiatrists involved and how the 'men in white coats' would take me away. I was clear in wasn't loved and I saw love as a shameful, embarrassing flaw.
As a young child, she dressed me like a boy and cut my hair short because I wasn't pretty enough to have long hair or wear dresses. And then she mocked me when people thought I was a boy because it proved that I was ugly.
As a teen, she went into school to tell the school she didn't want me doing 9 GCSEs because I was a girl and so they'd be no use to me. She wanted me to do childcare and typing which, at the time, were designed for the girls in the 'remedial class'. Thankfully, the school supported me.
She criticised absolutely everything about me. From the way i looked, to my personality, my interests, my character. I genuinely believed for many years that i was just an aberration. I had no friends because I didnt trust anyone who said they liked me because of the things she said.
She made me homeless and threatened to cut my grandma off when my grandma said I could live with her. I ended up in YWCA supported accommodation because of the lies she told about me. I was never given a reason for being there beyond 'not being right in the head'.
When I became pregnant with my first child, he cheated and the relationship ended. I had no alternative but to move back 'home' temporarily. Unbeknownst to me, she arranged for me to go into a SS run mother and baby home. I can't see how she achieved it without lying because all of the other mothers in their were drug addicts, care leavers, on CP plans or had babies on CP plans and were undertaking parenting assessments or had their childen removed. The staff including my keyworker said they had no idea why I was there because I didn't need to be. But she also became obsessed with the fact I needed a SW and used the fact I was in there as the reason. When she was the only reason I was there.
She made countless attempts to sabotage me in various way and when it worked used it as evidence that I was mentally unstable.
By the time I was in my 30s, she told my brother she didn't love me. She didn't hate me and didn't actively want something bad to happen to me, she just didn't care if it did.
Anyway, when I was 37 she did something that resulted in the police and SS becoming briefly due to concerns around her. It was made clear to me that, should I continue contact, a S47 enquiry would be opened and I was at risk of losing the children. I haven't seen her since. Tbh, I didn't need much encouragement by then.
And just in case anyone thinks there's no smoke without fire, I saw a psychologist who said there was nothing wrong with me mentally that a bit of distance from my mother wouldn't solve. I have a first class degree, a masters and work in a professional field with a clear enhanced DBS. I've never had SS involvement but the entire family has cut her out.
Going nc was a bit of a coup for her, though. Legally, I can't tell anyone why and she has lied telling people it was down to my mental instability.