"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:ML76-YVM : accessed 19 March 2022), John T O Bryant in household of William M O Bryant, Muldrow, Sequoyah, Oklahoma, United States; citing enumeration district (ED) ED 203, sheet 13A, family 248, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1272; FHL microfilm 1,375,285.
Find a Grave, database and images (https://www.findagrave.com/memorial/30378339/john-t-o'bryan : accessed 19 March 2022), memorial page for John T. O'Bryan (1895–1968), Find a Grave Memorial ID 30378339, citing Konawa Memorial Cemetery, Konawa, Seminole County, Oklahoma, USA ; Maintained by Kathy Stokes Hudson (contributor 47052010) .
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DNA Connections
It may be possible to confirm family relationships with John 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 John: