My mother used to call me for help because “there’s a strange man in my bedroom claiming that we’ve been married for 53 years”. My poor dad.
It can be really sad.
Prayers for you and your father. I called my mom on Sunday, and when I told her my 59th birthday was last week, she asked, "how old am I?" In her Mother's Day card, I included several recent pictures of our gang. A couple were confusing, as my daughter included pictures taken last Father's Day, before I lost 30 lbs.
I refer to the "Before" picture as the "Pillsbury Dough Boy's Evil Father".
My dad died from a brain tumor. My mom asked if he knew her and he said “Yeah, you are a friend of my wife.” Close enough.