MIL is in her 80s.
We have suspected that she might be developing dementia for a few years now, but over the last few weeks she has suddenly become extremely paranoid.
DH is an only child, she lives close by and we do a lot for her, but now has suddenly started accusing DH of stealing or hiding her things. She is absolutely convinced that he sneaks into her house and moves or hides her things (often jewellery but letters too). Then, when they inevitably turn up again, he has sneaked in again and put them back.
DS and I are accused of helping him and covering for him. There is no way of reasoning with her about this.
We have spoken to her GP, and they did do some tests and have apparently told MIL that there is nothing wrong with her.
Has anyone else been through this?