Sorry to hear of all that
My mother suffered with Parkinson's for the last
few years of her life, and it's as hard on the relatives
as it was her. I cared for her until I couldn't any
longer, and it took a toll on me mentally and physically.
She started out with periods of weakness and some
mental spells, then went on to full on hallucinations
and combative behavior. Elbowed my nose bloody
at one point. I suspect she had some mini strokes
although the medical people never said so
She finally had to be hospitalized on Christmas day
and stayed 2 weeks before being released into
home hospice care. I managed to help her along
several more months until she finally passed.

The only advice I can give is to have way more
insurance than you think you need. Her last days
took every dime I could muster and more.
Don't let an elderly person handle the legal
and financial business. If one of the relatives
can't do it legally and ethically, get a lawyer
or administrator
There's nothing easy about the whole mess and
I hope anyone that has to deal with it has much
strength and the ability to make tough decisions

Good Luck and prayers for you