"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XM5F-MP3 : accessed 30 September 2017), William H Cook in household of George S Cook, New Haven, New Haven, Connecticut, United States; citing enumeration district (ED) ED 98, sheet 17B, line 87, family 310, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 277; FHL microfilm 2,340,012.
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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 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 William: