Parents often struggle to go NC with abusive children, partially because they continue to feel responsible for them. But on MN I've seen several threads where the parents has been told to go LC with a child because they are abusive.
I agree with the "straw that broke the camels back" scenario described.
I had an emotionally abusive childhood, was the emotional support for my unstable mother who put me and my siblings directly at risk of harm (including nearly being murdered by her partner at one stage).
Growing up in that environment, and understanding that families "didn't air their dirty laundry in public" I had no idea that my childhood was abnormal, or that our family relationships were toxic until I was about to be married.
My inlaws are not perfect, by a long stretch of the imagination, but they are relatively normal people with normal issues and hang ups and they make mistakes like everyone else.
They did make me realise what it was like to be in a relationship with parents who wanted what was best for the child, and was proud of them.
If you don't do well enough, then that's a reflection on the parent, but don't do too well in case you outshine them.
My mother picked fights when she didn't have absolute control of a situation or if I decided to do something she didn't agree with (at the stage when I was an adult no longer living at home). These fights brewed for a couple of months before they blew up, because I didn't want to confront her and the deal with the fall out.
When I had children I had no idea how to parent. My instincts contrasted sharply with the way I was brought up, and it left me an indecisive mess.
I had a lot of therapy to get to the bottom of how I was feeling, and I honestly have been able to forgive my mother for my childhood. She's not able to deal with relationships properly, and she's not doing it on purpose.
Unfortunately, despite my forgiveness for my childhood, she hasn't changed. She still tries to manipulate everyone around her, and throws tantrums when she doesn't get her own way.
She plays favourites with my children (as she did when I was a child), and had already begun bad mouthing the other set of grandparents to my primary school aged children.
When she began trying to pick another fight with me, I ignored it for as long as I could, but eventually she pushes so far that it can't be ignored.
We were not speaking for 6 months (in Covid) before I realised how a massive weight had been lifted from my shoulders. We had birthdays and Christmas with no demands and unreasonable behaviour, which was unusual and very welcome.
At that stage I reapplied that I could get back in contact (with no apology from her) and act like nothing had happened, and in 6 months time we'd repeat the cycle, or I could decide to let it go.
It is exhausting trying to deal with her disruptive and horrible attitude to other members of the family. Trying to stop her from berating other family members (who had done nothing wrong), from treating my children differently, from picking fights with me so she could storm off and send me abusive text messages, and then act like nothing had happened.
My children are too young to have direct contact with her, but in a few years she'll be able to contact them directly, and even if I choose to walk away, she'll be able to contact them and continue to manipulate them.
So I chose to walk away to stop my children from having to deal with her. I can handle her, I'm a grown up, but they shouldn't have to tolerate such a toxic influence.
In doing so I've lost every single member of my family. They have all been pushed into getting involved and to try to get me to speak to her, because that's what usually works. It weighs heavily on me, and affects the relationship I have had with them.
I knew that would happen as everyone is scared of her and it's much easier for all of us if I fall in line and just get back in contact.
I feel guilty all the time that I have no one on my side of the family to support or have a relationship with my children.
It certainly was not done on a whim, or because of something small.
The final falling out was when she refused to come to my youngest child's birthday, because she's not the favourite, when she'd been to both her siblings birthdays in the weeks before. It sounds small, but it's not the entire reason we went NC. It was just the event which caused me to realise that our lives couldn't carry on like this forever.
People don't choose to cut parents and family members out of their lives for no reason. It's because continuing contact becomes unbearable.