Not his hand, something in the background.
And the wall behind the bench might be "stretched" and "filled" to try to make it work better.
Look at the top of the stone wall just to the left of the grandfather. Why does it dip down and seem to fade, disappearing into his neck?
Also, can anyone remove BO from the pic and push the grandparents together? Looks like someone photoshopped BO between them. He is a little grainy - they are not.