My father has dementia but lives at home with my mother and he can generally handle day-to-day tasks such as getting himself showered, helping around the house and yard. My mother is very depressed and, I think, verbally abusive to him. She also drinks. Some days (or multiple days) she drinks and spends most of the day in a napping fog in an easy chair or closed off in the bedroom. I have noticed a pattern over 2 years: she ramps up the verbal abuse, drinking and napping. He starts to get confused about who she is and where she's been. He starts to refer to the "New Mary" and the "Old Mary", and the "Big Mary" and the "Little Mary", thinking there are two of them, and this new, nasty one is not his wife. Then he gets paranoid, calls her a scam artist who is squatting in his home, asks what happened to his wife, and then is prone to wandering. Does it seem reasonable that her behavior could send him into these confused states? Otherwise, he scrambles names but is not generally confused about who family members are in relation to himself. This pattern started in 2015. Any thoughts are appreciated!