Maybe she likes to be the centre of attention, and like a child who wants ALL the attention, will.do and say anything to get it. She sounds like she has always got her own way, isn't used to not having all eyes on her. I don't think it's dementia or anything like that, I think she is an attention seeker, and because you don't say anything back, she knows she can say and do anything to you. My advise Redhead Chat, bite back! Tell your husband you are not prepared to take anymore of his mother's nastiness, that you are no longer just going to sit and take it. I had the same kind of behavior from my mum towards my son, yes her grandson, she was vile, told him he was one ugly child, bought things for my daughter but not for him, in the end I told to go , not to visit until she could be nice to both her grandchildren, until she died it was an unpleasant relationship, she was polite with an icy feel, sad .