The answer seems obvious except that the sufferer is my father in law and the carer is my mother in law. She has terrorised my husband and his siblings for their whole lives and he is the only one left who is still in contact with them. She tells FIL off for forgetting things in a really spiteful way, talks about him being "work" and not having "a day off from him" when he is standing right next to her and reminds him constantly of all the unintentional things he has said which have hurt her feelings. She also puts her face close to his and shouts as "he can't hear her otherwise" and does things like takes him out in the car to the shops and then locks him in it whilst she buys things. This can't be right surely? What can I do? We have tried to talk to her reasonably but she just shouts back and threatens to cut us out of his life. She has already disinherited my sisters in law and my husband is terrified that she will stop him from seeing his dad if he confronts her. Help and practical advice needed!