"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M66Z-86B : 14 July 2016), William Black in household of J C Black, Kings Prairie, Barry, Missouri, United States; citing enumeration district ED 2, sheet 229B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0672; FHL microfilm 1,254,672.
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DNA Connections
It may be possible to confirm family relationships with William 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 some percentage of DNA with William: