I don't understand why, but my 84-year old Mother, who was diagnosed with dementia last year, openly insults the woman who is always loving and caring towards my mother. This woman was married to my cousin (my mother's nephew) for many years up until his death 3 years ago. Brenda lives across the street. She does not drive and lives alone and is lonely in general. My mother used to be sweet and nice to her, but lately she is almost hateful toward her. My mother will make disparaging about her. Of course, my mother thinks she is saying these things discreetly, but she is not. Brenda's feelings are hurt regularly. I tell Brenda that Momma does not mean these things, but I think she really does mean them. Mother acts distant from Brenda when other people are around, but when they are alone, she begs Brenda not to go back home. I think that my mother wants all of the attention from other people, and she feels like Brenda takes that attention away. I think my mother is jealous of Brenda around her (my mother's) friends and family. Any advice?