"Ontario Marriages, 1869-1927," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:FMFL-2HN : 1 January 2021), Richard Duke in entry for William Duke and Berthie Fitchett, 20 Oct 1870; citing registration , Markham, York, Ontario, Canada, Archives of Ontario, Toronto; FHL microfilm 1,862,475.
"United States Census, 1810," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XH25-P9M : accessed 16 February 2021), Richd Duke, Culpeper, Virginia, United States; citing p. 89, NARA microfilm publication M252 (Washington D.C.: National Archives and Records Administration, n.d.), roll 68; FHL microfilm 181,428.
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It may be possible to confirm family relationships with Richard by comparing test results with other carriers of his Y-chromosome or his mother's 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 Richard: