"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SP4D-PQD : accessed 27 June 2017), John B Mclain in household of J Eldridge Mclain, District 6, Hawkins, Tennessee, United States; citing enumeration district (ED) ED 13, sheet 10A, line 26, family 211, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2254; FHL microfilm 2,341,988.
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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.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Gerald McClain :
Y-Chromosome Test 700 markers, haplogroup R-FTB21012