I was reading the ‘So bizarre’ thread p342 written by Ann Mac last night and someone mentions this issue which Slugsta mentions it is called Capgras Syndrome. They mentioned that searching on that name might give some helpful info and I just wondered if it might help you too.
I am afraid me and my brother just told Mum that if she did not allow us to have Power of Attorney SW’s would make all the decisions about her health, finance etc and there would be nothing me and brother could do. I think she agreed as she thought me and brother were the lesser evil. Mum was still at a fairly early stage at this time.
I really hope that your Mum will agree to the Carers so that at least you might get some sort of break