↑ "United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWVP-SKT : 15 July 2017), Marey E Vandermark in entry for Rolf Vandermark, 1880; citing enumeration district ED 4, sheet 64B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d), roll 1202; FHL microfilm 1,255,202.
↑ "Texas Deaths, 1890-1976," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KS1H-W9L : accessed 11 January 2016), Ralph R Vandermark, 29 Jan 1968; citing certificate number 29896, State Registrar Office, Austin; FHL microfilm 2,137,026.
↑ "United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V3SY-H6J : accessed 11 January 2016), Ralph Vandermark, Jan 1968; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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It may be possible to confirm family relationships with Ralph 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: