My mother asks how my husband is doing and how he is good at fixing things. She says a lot of nice things about him. Then when I take him to visit, she tries to stab him with a fork and tells him the devil is waiting to take his soul to hell. It upsets his children that she treats him that way. I wonder if she knows what she is doing. She has dementia but sometimes she is the sweetest and other times she is mean as a snake.