"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJJD-SSD : accessed 26 November 2016), John L Duncan in household of Samuel B Duncan, Norfolk Monroe Ward, Norfolk (Independent City), Virginia, United States; citing enumeration district (ED) ED 122, sheet 10A, line 20, family 221, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1902; FHL microfilm 1,821,902.
United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:CCS6-KPZ : accessed 26 November 2016), John J Duncan in household of Samuel B Duncan, Norfolk, Norfolk (Independent City), Virginia, United States; citing enumeration district (ED) ED 84, sheet 1B, line 81, family 19, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2471; FHL microfilm 2,342,205.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VTMQ-HYK : accessed 26 November 2016), John Duncan in household of Samuel Duncan, Area C, Norfolk, Norfolk City Voting Precinct 24, Norfolk City, Virginia, United States; citing enumeration district (ED) 114-104, sheet 10A, line 7, family 190, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 4314.
"United States, GenealogyBank Obituaries, 1980-2014," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QK4N-L17P : 22 July 2016), John Garth Duncan in entry for Foy Hurdle Duncan, Norfolk, Virginia, United States, 04 Feb 2003; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing Virginian-Pilot, The, born-digital text.
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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: