re: Wife’s uncle is disrupting care plan for her father who has dementia

I’m dealing with a similar situation. My mother has dementia and has been living in my home since last summer.
My wife and my mom’s sister are both in denial. They don’t believe she is as incapable as I do.
Sister volunteers to take mom to the doctor and drops her off and leaves! Mom can’t tell the doctor when her symptoms started or really what her symptoms are (non dementia illness).
Wife and I took mom shopping yesterday. I stayed in the car to listen to a baseball game (my mistake). Wife texts me to say she is waiting in the dressing room for my mother to return from the restroom. I look up and see mom walking back into the store, she got lost between the dressing room and the bathroom.
Sister made mom drive her home from sister’s doctor’s appointment last month. Not just around the corner. An hour and some change from home! I spoke to the sister about it, she says she had no alternative as her eyes were dilated and she couldn’t see to drive.

I believe some people just don’t want to accept that the dementia patient is not the same person as before. It’s really a sad situation.