I am also a strong advocate for going NC without the tip off. I have twice had to this with my parents. The first time was the culmination of years of abuse and then a very serious situation involving my brother. I told them explicitly; it didnt end well. They tormented me for a couple of weeks before finally getting the message.
I was like that for 18 months. My ex told me that Dad was very unwell and likely to die. I broke NC as my mum was primary career. Wish I bloody hadn't tbh. It was a time when I really needed support after my own suicide attempt in march.
I do help her and we become closer. Then, completely out of the blue and from hospital, Dad confesses to multiple affairs with multiple women over the years. I had suspected it but had thought not to share my suspicions too much. There had been whispers down the years, you see.
But it was mums' reaction that was off. As time wore on, I began to think that it wasn't normal. Too calm. Too rational. It all came to a head after weeks of running around after her, ferrying her here and there when I had planed a day trip out to a stately home as a treat. And in a sentence you would think comes straight out of mumsnet...
[she gets angry at me]. "No Ren, am not coming to see you this weekend and you can forget taking me to the stately home. Your car is a tip and I wouldn't be seen in it."
I was devastated by her cruelty. I told her so and she attempted to minimise it by saying, "Oh dont listen to me etc, lets put it behind us."
No mum. Let's not.
It took a few more weeks but I did go NC about a week or so back. Blocked all numbers. Only last Sunday I find two missed calls from unrecognised mobiles on my phone (within mins of each other). So that will be Dads phone and brothers second phone then? No matter. Blocked.
Sometimes, it is utterly necessary to have these people removed from your life.