"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MH57-BVB : 12 April 2016), James R Gwinn in household of James W Gwinn, Randolph county, Randolph, Alabama, United States; citing family 1, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"United States Confederate Officers Card Index, 1861-1865", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:7QS1-GK6Z : 6 September 2019), James Miles Killian Guinn, 1861-1865.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M98M-5LD : accessed 21 November 2019), James M Guinn, Precinct 13 Bethlehem (east part), Chambers, Alabama, United States; citing enumeration district (ED) 16, sheet 23A, family 418, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,006.
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DNA Connections
It may be possible to confirm family relationships with James 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 James: