"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K78M-CKY : 15 March 2018), Earl Hinkle in household of Charles Hinkle, Dry Fork Magisterial District, Tucker, West Virginia, United States; citing enumeration district (ED) 47-9, sheet 10A, line 19, family 163, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 4448.
It may be possible to confirm family relationships with Earl 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 DNA with Earl: