This has been going on three years and is getting worse. My dad walks with a Vance. Mom accuses him of leaving in the middle of the night to have sex with the neighbor and to smoke pot there. (Both parents are devout Christians). Mom accused dad and had him get tested for dementia and Alzheimer’s. He doesn’t have either. Mom was also tested and told us she also doesn’t have either. They live in their own home close to me. Dad says some days she is good. She gets very mad at me for not believing her. She thinks the neighbor leaves her phone messages saying please die. She thinks dad is a sex maniac and wants sex all the time. I don’t know what to do.