I'm currently having covert pressure applied by two family members to resume contact with another family member (sibling).
I won't do it. I went through hell when I was shunted as a kid to hers for holidays so DM and DD didn't have to bother with me - the drunkeness, the rowdy parties, the screaming, the throwing things, not having enough to eat.
Then when I was older, when she had a skinful, she'd ring me at 2-3am in the morning, in the hall of residence I was in, to drunkenly scream, and cry down the phone. It was mortifying. And it meant, that any late night calls, I had to get the phone!
I'll never forgive her for how she was the day our father died. The above might give you a clue.
I've had to try and help her daughter, from far away, because you can imagine what she's like as a mother. All her kids have lifelong issues, including addiction. Can't think why.
Anyways, due to some fairly scary health scares, she's (apparently) given up the booze, and smokes. Good on her. I'd give it a bit longer than less than 6 months before I thought it was forever (especially from what I've heard from her daughter).
I still want nothing to do with her, especially not anything that involves her being able to phone or message me.
She will never treat those family members the way she feels she can treat me.
Apparently I'm being immature, and should just let bygones be bygones.
Just for once in my life, I'm setting a boundary based on my self interest.