Your mother's behavior brings back really painful memories of the drama that occurred in my home when I was in my early teens, back in the 1950's. My mother, whose Parkinson's had been diagnosed more than a decade earlier, began exhibiting florid paranoid behavior which was totally uncharacteristic of her. This continued off and on for the balance of her life, some twenty-five years.
Needless to say, the home atmosphere that this aspect of her illness created kept the family feeling as if we were walking on eggs.

Knowing what I now know, I attribute her behavior to the dementia which often develops in PD.

I'm so sorry for what you and your family are going through.

My best wishes,

Robert