"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XMYP-G8L : accessed 7 January 2018), John D Harrington in household of Erin Harrington, Bastrop, Morehouse, Louisiana, United States; citing enumeration district (ED) ED 4, sheet 7B, line 83, family 174, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 799; FHL microfilm 2,340,534.
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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 test-takers in his direct paternal line.
Mitochondrial DNA test-takers in the direct maternal line: