Thanks everyone for the kind words and solid advice.
After talking to my sister and several colleagues and reading everyone's wonderful answers @Scepticalscribe @Clix Pix @Huntn I told these acquaintances no they cannot borrow the car for this or anything going forward.
Mom doesn't have dementia (but the medications are making her more loopy than usual).
Anyway, time to up my skills in google docs.
Again, thanks everyone for the thoughtful, long replies. I may not be able to respond directly, but I do truly appreciate the time and advice you shared. I will definitely save some of them
You are more than welcome, very happy to be of some support - not least as I have some idea of what you are gong through.
As @Apple fanboy has already said, we are all here for one another, and I, for one, have found this community to have been very supportive.