That is a very scary story, who knows what might have happened?
I do want to say that my dad has altzimers, and in his moderate stage, he loves small children. If we go out anywhere, I have to keep an eagle eye on him because he will walk up to strange children and start talking to them.
One day, we were walking in the local mall, and I did not notice he had stopped walking. When I realized he was not beside me, I looked back, and he was hovering over a baby carriage a few steps back. Scared the 'heck' out of me. I rushed over, and fortunately the couple were very kind, I told them about his disease, that he just loved babies, and then apologized PROFUSELY. What REALLY scared me was he had his hand out like he wanted to pick up the baby

- He has never done anything like that before.
Since then, I have not ventured back to the mall with him. We go on long walks in the park, or long drives, or we can still go out and eat. Its sad that his walls are closing in on him, but I just cant risk what he may or may not do, even when I am super viligant.
I wondered if the grandfather in question had some sort of disease. I know, even if he did, the caretaker should have been right there with them, and corrected the situation, or not put him in the environment at all. But I will say, having dealt with this horrible disease, that people with altzheirmers progression appears not to be in a linear fashion but with huge bumps and dips. Sometimes they just totally shock you with a huge deviation in behaviour.