Asks for the Impossible
At 88 years old my Mom is suffering from dementia different than Alzheimer's. Her memory is largely intact but she has delusional experiences most of the time. The difficult part is that she often wants me to do something that is impossible to do.
Example: she wants me to bring her dogs to her along with dog food for them Fact: she has no dogs. Dogs that she did have, have died. No amount of redirecting or anything satisfies her and she ends up angry and sometimes very difficult. She is also completely bedridden.