I have no experience of anyone with dementia. My mother-in-law has been recently diagnosed. She is now in a care home and I visited 2/3 times a week. My wife, her daughter, died 10 years ago. When I visit she asks me why I have not been for several weeks. She says I have another woman (I do not) and that I am planning to go away with her and my mother-in-law's pension/savings. And she has called the police.
Do I try to correct her, argue with her or just agree with everything she says?