Prayers sent man, that's really rough. My grandma had Alzheimers and one thing my dad always did was a lot of activities to keep his mind engaged to try and make sure he wouldn't go down that road. He went a few years back and never had to go down that road thankfully. It's rough especially if you have kids, etc. that didn't get to know her when she was herself. I'll just mirror what others have said, remember who she was, talk to her like she knows you and don't get upset at the things she doesn't remember.
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