I know about Older Sister Syndrome. But have you ever heard of this happening?

[Grasswire2]

5. interesting comment of yours

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.