re: A family member with dementia and telling them they can't drive

I think for some people they aren't just fighting the practical reality of being unsafe drivers - part of the fight is sort of a metaphor for losing their life.

In that sense people with dementia are understandable when they try to drive in spite of being very dangerous on the road. If the issue is really just being able to get around town things like uber can help after the car is taken away.