↑ "California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VP6W-6FY : 26 November 2014), William Preston Duncan, 21 Jun 1957; Department of Public Health Services, Sacramento.
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DNA Connections
It may be possible to confirm family relationships with William 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: