My mother, who is 88 years old, moved in with us earlier this year after a fall and it became apparent that she could not go back and live alone. She was subsequently diagnosed with Alzheimers ( early stage). When we go away, we arrange for a live-in carer to come and live with her , in our house. We have done this 4 or 5 times this year. My step-daughter , who lives near-by, comes in to visit when we are away and brings fish and chips etc. She has a 5 year old son. On this last occasion, my mother has become nasty towards them - asking why she is using our car( which I have agreed she can do), saying the child can't play with the toys, never saying please or thank-you plus a long list of other things, according to my step daughter. It is as if my Mother wants to take the opportunity to "be in charge"and boss them around. If I ask my mother about it, she either denies it or argues with me about it. My step daughter says this is unacceptable behaviour and that I need to do something about it. My stepdaughter is a bit of a drama queen so I am left wondering what to do and who to believe. Has anyone got any experience of this sort of thing or any advise they can give me please.