1940 census Image, I read as a T, for Thomas, and the date is right for Thomas B.
Sources
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDXP-PD6 :Thomas B Sparks in household of James E Sparks, Goodwill, Madison, Arkansas, United States; citing sheet 7A, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,071.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VBJH-6J8 : B Benjamin Sparks in household of Elmer Sparks, Lees Creek Township, Adair, Oklahoma, United States; citing enumeration district (ED) 1-6, sheet 22A, family 349, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 3274.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J1BQ-NJ4 : accessed 13 June 2016), Thomas B Sparks, 04 Jun 1994; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing)
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DNA Connections
It may be possible to confirm family relationships with Thomas by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Thomas: