Dad has Alzheimer’s disease. You are a loyal daughter (Jill) who visits often and brings his favorite foods. On one visit, Dad has a big smile when he sees you. “Hi Mary” “Dad, I’m NOT Mary. (Mary is your older sister.)  What’s my name?” “Oh, gosh. Where’s Mary?” “Dad, I’m Jill!! Why do you always ask about Mary? Are you trying to get on my nerves?”