↑ "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSGP-XC8 : accessed 7 April 2017), William J Vandemark in household of Oscar Vandemark, Hurley Township, Election District 1, Ulster, New York, United States; citing enumeration district (ED) 95, sheet 8B, family 187, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,169.
↑ "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M59Z-1DN : accessed 7 April 2017), William Vandemark in household of Oscar Vandemark, Montgomery, Orange, New York, United States; citing enumeration district (ED) ED 42, sheet 17B, family 395, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1059; FHL microfilm 1,375,072.
↑ "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MV9N-81D : accessed 7 April 2017), William Vandermark in household of Oscar Vandermark, Montgomery, Orange, New York, United States; citing ED 134, sheet 8A, line 37, family 196, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1253; FHL microfilm 1,821,253.
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DNA Connections
It may be possible to confirm family relationships with Oscar by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: