My wonderful father, the kind of person who puts the “human” in humanitarian, is in assisted care because of Alzheimer’s. I talk to him daily and take him home with me often.
I know this probably sounds facile, but I think you have to be philosophical about it. He’s had a great life. He’s like George Bailey - no one could ask for more. So now he’s slowly fading away, but he has amazing hallucinations that he enjoys telling us about, and days when his memory is clear as a bell. When that happens, my siblings and I jump in to remind him of all the happiness he’s given us. We even try to see the humorous side of the incontinence issue, and laugh with him about it. It helps.
I sincerely hope your sister finds comfort in God and her family around her. I’m wishing all of you a wonderful Christmas.
My aunt on my mother’s side was the most recent family member who had it. I watched her as she went through a very agressive and sometimes violent phase. The doctor changed her meds and it made a world of difference.