Namechanging for this as I don't want this to be recognised IRL.
My mother has not spoken to either of her parents in about 10 years. When I was a child we were relatively close to them but she had issues going back to her childhood which I know about but don't want to disclose here and found them generally irritating and difficult so she cut them off. I am not 100% certain of the precise reasons, and tbh don't know if there are any or just a slow burn "I can't take them".
They are now elderly, and not going to live forever. She says that she'll deal with any remorse if it comes, and that's as much as she'll say on it.
I have two much younger brothers and a sister who can't remember them and hence aren't bothered in the slightest (to them it's as if they're dead). But I can, and while I know that they had their considerable faults I also know, and can remember that they did very clearly love me and my mum. My mother had her reasons, but she is very hard on people's faults whereas I and my dad are much more forgiving and like to "take people with us".
I miss them a little bit TBH and I have ever since we stopped seeing them. My dad has recently suggested I get back in touch as an attempt to heal rifts before it's too late.
My mother has always said that I can get in touch independently but I don't know how she'd react if I actually did. I would be between a rock and a hardplace - tell her and deal with her reaction or don't tell her, which is a fairly major omission and deal with the consequences if somehow she finds out. She is absolutely not toxic, but she is very insecure and a little bit irrational - she sees the mistake someone has made before the good they have done, if you get what I mean.