The man could be Phillip Hairston, my great-grandfather. It is probably not Floyd Thompson. I believe that the boy is my uncle, Hairston Albritton "Buster" Bryan, at about age 4 which gives a date for the photo between 1909 and 1911.
During this period, the Bryans and Hairstons lived in the Levelview community in Baylor County, Texas. Is that a church behind the tree? I don't believe that it is the courthouse in Seymour.
I would love to find the original photo. Jackie's genealogy and copies of some of her photos are archived in the Denver Public Library. This photo was not part of that collection.