"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K7YH-5QJ : accessed 1 January 2018), Curtis Spence in household of Willie Spence, Magisterial District 5, Martin, Kentucky, United States; citing enumeration district (ED) 80-7, sheet 11A, line 26, family 159, 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 1339.
It may be possible to confirm family relationships with Curtis 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 Curtis: