"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ4Y-Y3B : 12 April 2016), John Wm Mcclure in household of Jas B Mcclure, West Virginia, United States; citing p. 8, family 54, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 553,196.
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DNA Connections
It may be possible to confirm family relationships with John 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: