It was difficult... I was one of his care givers at the end (last 6 months) and I have a memory of one night he was up and I heard a commotion. I went in his room and he was on the floor trying to put out fires (not there) I told him "Dad, dad, come on we have to get you back in bed." He was going about 220 at the time? And not in very good shape, so I double underhooked him and dead lifted him off the floor and put him in his bed. He looked surprised! As I tucked him in, he looked at me and said "you're pretty strong for a woman?" And I LAUGHED OUT LOUD! And I said, yeah, yeah dad, I guess I would be pretty strong for a woman :-) (he thought I was a nurse I think)
But what was really interesting is, he confused me, he confused my sister, but I had a young son (less than a year) and whenever he would see him, he would light up like a bulb and smile and say, "There's my grandson!" Right to the end, he knew that boy, and he always made him smile.