My mother is 95 and in good health, in a residential care home and has dementia. This is manageable as it usually just forgetting things we have told her recently. She remembers the past. Our problem is that she is obsessing over a wheelchair! She has one in her room that was used by my father before he died but it is only used occasionally for hospital appointments etc. She uses a triwalker the rest of the time. She thinks she has another 'light weight wheelchair' but that someone has taken it away! (she has never had another). She is getting more and more distressed about this and we don't know how to cope with it. Do we keep saying that there was never another chair or do we say something like it's been disposed of as was not needed? I'd be glad of any advise.