Bartow Frank Clay, Jr registred for the WW I draft in Fulton Cty Ga, not Texas. He listed date of birth as June 1, 1884. Bartow Frank Clay died march 14, 1976 in Dallas Texas.
One famiy tree at Ancestry.com has Bartow, father of your Bartow, as the son of Bartow Calub Clay and Tlitha Wilingham (Bartow and Tlitha are both listed as 69 years old on the 1930 Fulton Cty census). Bartow Calub as son of John Hamton Clayand Mary Lee jane Combs(Coombs) . I couldn't find any of these families on any of the Ga census.
On the 1930 census, living next door to Bartow and Tlitha Clay, is Emma Clay, 35, widow, born Texas, father Okla; mother Texas; I wonder if this is a daughter in law of Bartow? Robert O Clay was married to a Emma, born Texas on the 1920 census.