↑ "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:ML75-QWB : 29 October 2015), Walter Vandermark in household of Alfred L Hart, Hackberry, Texas, Oklahoma, United States; citing enumeration district (ED) ED 251, sheet 2A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,375,286.
↑ "United States Public Records, 1970-2009," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QJP2-26M4 : 16 May 2014), Walter Vandemark, Residence, Rush Springs, Oklahoma, United States; a third party aggregator of publicly available information.
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It may be possible to confirm family relationships with Walter 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: