My 90 year old grandmother lives with me. She has always been a negative, unhappy, conflicted, individual. This is really becoming more and more obvious as she ages. She has all of her faculties, she is in great health, yet she demands there is something wrong with her health. When I curb those ideas, she begins insulting me in very nasty ways. I try to have a relationship with her, but most times I don't want to be around her because I'm tired of the verbal abuse. She will get really nasty and then 5 minutes later act like I should have forgotten by now. I grew up this way, as an adult I no longer welcome it. She has nowhere else to go.... What to do? Suggestions for responses or managing her disrespect and insults?