When I was a kid, she used to call us "Grandma's dividends." Now I'm the age she was when she said it. Your photo so clearly depicts your own perspective of granddad-hood. You're tall and see a much wider world than your grandson can. But, if you're jaded like me, you can only feel that same innocent excitement vicariously through your little Duke. And now I can get it third hand from you. A marvelous photo.
Nice shot. Despite not being able to see his eyes and face, his body language totally expresses his present emotions. Nice use of the sidewalk as framing as well.