My heart really goes out to you and your family with this situation, having been through it, too. Something that brought me some comfort with my own mother is the realization that I didn't really know  what was happening in her head. Even on days when the Alzheimer's prevented her from speaking or seeming to know who I was, my mother seemed to derive some measure of happiness from simple things: flowers brought to cheer her, or ice cream served in the dining room. It made me understand that — perhaps — she was doing better on the inside than we imagined, and the sadness and fretting were more on our part than hers. BIG HUGS to you as you continue through this... ❤️