I cut off contact with my father when I was 18 or 19. He'd been abusive through my entire childhood and I never really liked him. But the final straw was when he phoned me on his birthday [I hadn't lived with him for a few years at that point] and said that I owed it to him to spend the day with him. I told him to fuck right off, hung up the phone, and never spoke to him again. [Funnily, Mom witnessed that phone call and literally applauded and cheered for me telling Dad to eat shit.] He died the same year at 50yo.
I cut off contact with my mother when I was 27 or 28. She abused me all throughout my childhood--sometimes in the same ways as Dad. I just stopped answering her phone calls when I'd finally admitted to myself how much she fucked me up. I blocked her number. She lived thousands of miles away and didn't know my address, my new phone number, nothing she could do to bother me. Cops showed up once because she reported me missing, but all they could legally do is tell her that I'm alive and fine--couldn't tell her where I was, give her my contact info, nothing. She died in '20, she was 59yo.
I don't need replacement parents or family, I have no regrets at all for what I did. I'm quite happy being alone. I do have friends, but they don't sub in for family at all.