fidgit blankets
A fidget blanket only be large enough to cover the lap. I made one for my late aunt that was in a dementia ward. I made it about 18" square, I put a zipper on it, a pocket, a flap with a button hole and sewed a button on so she could button and unbutton it. Got some ponytail scrunchies and sewed them on. It does not have to be fancy, it is only something for them to fidget with. She adored it. Wished I had of done it sooner. Try going to pinterest, maybe they have some pictures of them there.