John Noble Conkin was born in Tennessee, a son of James Knox Polk Conkin, and Martha Ellen (Mowell) Conkin. John married Sarah "Annie" Phillips, a daughter of Jonathan Phillips and Rachel (Conkin) Phillips.
John Noble is found on the United States Census of 1880, living in Sullivan county, with his parents. His age is listed as three years, and his year of birth is estimated as 1877. 
↑ "United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDW6-VPP : 15 July 2017), John N Conkin in household of James K Conkin, District 15, Sullivan, Tennessee, United States; citing enumeration district ED 22, sheet 446A, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,255,281
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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 DNA with John: