"Who is Barbra Streisand?" My dad reaches a new stage.
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It's been small things mostly, like people he used to know casually at one time, or objects he can't identify the purpose of, or family recipes that are totally unfamiliar even though I grew up eating them.
The people are the weird part, because he's always been big on what he calls "small world connections", really just mining every minor coincidence into something "interesting" (perhaps to find out, but it's not much of a story to tell people, and he's more and more clueless about how dull such conversation is). He is absolutely fanatical about what a friend of mine contemptuously labels starfucking, that is, following these connections to famous people.
I grew up knowing he lived two doors down from the onetime president of the Lions Clubs International but it really sounds awful for him to tell people this for the first time.
He still has an excellent command of history and geography, things that are easily organized (I suspect).
But he's losing stuff that should have basic meaning to him. He didn't recognize the fake jack'o'lanterns (orange leaf bags with faces) on the back porch. He asked why they were there.