A treasured photo I'd imagine.
I have one such also, a photo I took of my dad at the Adelaide Oval. He had dementia too, and I'd taken him to watch the first day of The Ashes (a Test cricket series between England and Australia first begun in 1882/83.) It was stressful, I couldn't leave him alone at any point, but he loved it and I have some good photos to remember it by. Now he's gone they mean more.
Thanks for sharing this personal photo.