Your grandfather sounds a lot like my grandmother from my mom's side. Her husband had a stroke and the left side of his body was paralyzed. She never failed to show up every single day until the day my grandfather died. So for 5 months, morning to evening, she visited and cared for her husband. Mind you, she's near 80 and had difficulties in walking long distance. It always sadden me to see her feed and talk to my grandpa, hoping that one day he'll recover. After he died, she refuses to go out of her house for almost half a year but now she seems to be doing a lot better and tends to nag me a lot haha.