A book about Alzheimer’s

Please suggest me fiction about Alzheimer’s/Dementia, especially books that include the sufferer’s perspective. My grandfather has it, and I’m writing a short story about someone like him. I want to see the different takes on it, how people do it, and I want to be moved by pieces about this disease. The only book I’ve read with Alzheimer’s as a notable plot point so far has been Unbecoming by Jenny Downham, and that made a huge impact on me as a kid. Thank you!