I wonder why your ex dil decided to move in next to your son and felt the need to pass on news that she knew would upset you. Tell her shes not to talk. About famiky to you it upsets you, that should silence her.Have you tried to talk calmly with your son and try to resolve those things he feels are so bad he has cut you out. I had the same problem with my daughter, she undermined me, played mind games, would make arrangements and cancel , it was all very calculated, then she blanked me and everyone else. I thought there’s no point going on. I now realise, I didn’t bring her up to be cruel, just the opposite, that she treated other people badly, not her friends just her family, both sides, she now speaks to no family at all, has upset everyone, it can’t be everyone else that wrong. So a few years ago I made a conscious decision to let go. I don’t like what she has become. I remember the girl I loved, not what she became. I get down but it’s not because I want to see her.
Woukd you do what your son has? He’s spineless. He has the upper hand fo4=now, let him enjoy it. Have a good life, you have other family, care fir those that care for you, that treat you with common decency, you wouldn’t tolerate a friends treating you like this.
I think of these words, to thown own self be true.