I've been divorced for just over 20 years. Our children were still quite young and both of us made the decision not to give them reason to take sides. My ex subsequently re-married and I had no problem with her having contact with the children and even going on holiday. The only one who tried to pull me apart was my ex-MIL. Fast forward ... the children accept what happened, love both parents and they're well-balanced young adults. I still have to face it, if my daughter decides to get married because I really couldn't stand being in the same room as my ex-MIL. I've told my daughter to get married in secret somewhere remote!
Now, I'm in a different situation. My partner had an affair ten years ago and left his wife, who is still very bitter. This had nothing to do with me, by the way. I'm aware that I've only heard one side of the story and we've discussed it. I'm satisfied he's not a serial adulterer, but was in a marriage which was going wrong.
His ex-wife has told one of their sons that she doesn't want me to have any contact with the grandchildren, which has put the son in a very difficult position. Up to now, I've always made myself scarce when they visit, but my partner and I are planning to live together soon, so it's going to be difficult. The grandchildren call their grandmother "Nana" and I'm X. They just accept it, but the ex-wife can't.
My partner's son is getting married soon and I said right from the beginning that I didn't want to go to the wedding. I'm OK about it, but I don't know how much longer I can keep on being excluded. The ex-wife has called me something similar to "tramp" to one of the other children. The children jumped to my defence and, if anything, think less of their own mother. I feel in a very difficult position. I love their father and have tried to be "adult" about it all. I would love my partner to stop any form of contact with his ex, but that won't happen because she's the mother of his children and he still pays her (very generous) maintenance.
Just be careful Mariemal. Your children could end up cutting you off completely.