Every time I talk to my mom on the phone, just as I'm getting ready to say goodbye, she slips in an abrupt update about her parents — my grandparents. Sometimes they're in Switzerland. Sometimes they're in Loma, Montana. Sometimes they've gotten "mixed up with bad people." Sometimes they've completely disappeared or died mysteriously. Sometimes it sounds like a government conspiracy — a murder plot. At first, I didn't know what to say in return. I'd ask how they died or what they were doing in Switzerland. In more recent conversations, I tried to place her back in reality. I'd say, "Mom, your parents have been dead for forty years." I'd ask her how old they were and she would say 60, 70, or 75. She's not sure. She says that all the time: I'm not sure. "How old are you?" I ask, and she laughs and says, "Oh, I think I'm about 25." Once she said she was 18. She's actually 88 years old.
For about two years now, my mother has been fighting with Alzheimer's and the dementia that comes from that disease. She's had years of struggle with diabetes and epilepsy — but her mental condition was always sharp. A lifelong democrat and the mother of six, Patsy loved sewing, making quilts, reading mystery novels, and watching Seattle Mariners baseball while enjoying a Pepsi (never Coke). I am her youngest son.
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https://longreads.com/2017/08/11/forever-yesterday-peering-inside-my-moms-fading-mind/?