A couple more details...you may find amusing.
Her hatred towards my father had some basis—was not just craziness—and it was because of a fluke that she uncovered an old secret he had kept.
A couple of years earlier when she sorta competent the family lawyer had updated documents some of which she needed to sign.
My father was starting to get forgetful—and he forgot to brief the lawyer to keep one document secret.
When she saw the document she totally freaked out—which was why he had kept the secret all those years.
Then she forgot about it—for a while....and then maybe a month or two later she remembered again....
Crazy stuff—a comedy of errors.
One more story. About 50 years ago, my grandma, her mother, had 160 acres of land in central northern Wisconsin. My grandma gave some of that land to her granddaughter (my mom’s niece). About a year ago, my mom was going to sue her niece to get that land that should have been hers (in her mind). *sigh*