Your grandfather was such a handsome little boy in a well-posed photo, Kathryn! Do you know what he's reading? (I wonder if it's a prop supplied by the photographer?)
Thanks Yvonne! I zoomed in on a higher resolution version of the photo and he's reading The Professional Photographer. Good guess about it being a prop! The date on the magazine was hard to make out, but I think it was March, 1916.