I recently received a torrent of abuse via WhatsApp from him after a relatively minor disagreement on a news story I wasn't interested in (Harry and Meghan). It happened just as I started a week on-call as the most senior clinician, and I found I couldn't concentrate because of the things that he said echoing in my mind. Stuff that referred to things when I was less than half my current age, and hugely hurtful.
Why should I allow this in my life? An I risking the things I'm responsible for by doing this? My wife has pointed out I'm in a foul mood if I've been arguing with him about something. Is that fair on my wife and children?
However, she's very cyclical and can act normal ~30% of the time. She's told everyone that we're all drug addicts, or child abusers. Lots of people believe her, and think we all abandoned her. I've had family members call me and reduce me to tears with insults, because of the things she's told them.
From what I've seen anecdotally in every single family where the child has cut contact: there's ALWAYS a (good) reason. It almost always boils down to a failure in respecting their children, and treating them with kindness and understanding.
Younger generations are growing up with better mental health care and social awareness (due to the pervasive nature of it these days with social networks) than previous generations. We grew up in an era of public PSAs and school videos on bullying and acceptable behaviour. We know what's "right", can recognize abuse, and prefer to associate with those that treat us well.
They tell everyone they know that she's addicted to drugs and won't talk to them because they want to help her. In reality she's more successful than all of them combined, which she attributes largely to seeking mental health counseling and removing herself from their constant drama.
We're living through a reckoning for abusive people. In the past people were ostracized for cutting off their families for any reason, especially women... but now there's little reason to put up with this kind of bullshit. These cycles of familial abuse reach back generations and it's about time they're addressed.