I believe Glen to be the grandson of James H (b 1866) and Mary E. Keeter of Cloud Chief, Washita County, Oklahoma. On the 1910 census there are three sons: Rudolph, Rufus and Rex. Rufus married married Bessie in 1909. Rex married Ruth.
It is possible he is the grandson of James H. Keeter 1888-1925 and (another) Mary E b. 1885. James H. was the son of H.R. and Nina Keeter.
Any more information on these folks would be appreciated.