Rosanna started down that path and her siblings put and end to it very quickly.

But sorry youre going thru this

Over the last twenty years or so, she has turned her own children against their natural father (after which he drowned his sorrow in alcohol) as well as meddling in my relationships with grown children. There's something really wrong, emotionally and in terms of mental health.

First, I am really sorry you're going through this. It sounds really depressing for any parent to have these types of social dynamics going on. I had younger twin sisters so it was a very different situation, which them competing with each other at first, then going off in completely different directions so they could not be compared to each other at all.

Does this syndrome coincide with any personality disorders?

I've definitely seen mothers turn their children against a father, especially one who is accused of some cultural wrongdoing, or in the case of divorce.

It's kind of a strange behavior from the survival point of view. Maybe the daughter is competing with the mother, but it seems like the benefit would be really small, maybe only mattering to shore up the ego? (That's why I wonder about a concomitant personality disorder).

Wow, I sure hope this calms down. Nearly all of the annoying, bad things we three kids did when we were younger resolved as we matured. From time to time, old patterns reemerge, though.

This same daughter did also turn her own young adult children (my grandchildren) against their father after their divorce. Bitterly did it. He turned to alcohol, with a ruined life and eventually died.

She also interfered when her brother, my oldest son, ended up losing custody of his daughters. She was part of the wrongful attack on him.

There's obviously a mental health issue. Something to do with power over other family members.

If there's any interesting data, it's that her siblings (a sister, two brothers) called her "Hitler" in their growing up years for her bossy ways.

NPD (narcissism) seems too likely, and might just underlie something else. demonstrated by the willingness to hurt other family members in the grasp for power.

And think of this. She abducted my special needs daughter from our comfortable home (I have sheltered the SN dtr all of her 53 years) -- took her to her own home where SN dtr is currently living in the garage with the chickens. SN dtr had freedom here to take the bus to supermarket to shop by herself, she was safe in this very familiar and safe environment where she pursued hobbies and interests. Now she is constrained, and older sister intends to commit her to a residential facility for SN adults who are more disabled.

I went to Adult Protective Services when she was abducted, but they told me there was nothing they could do.