↑ ["United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNP1-LLG : accessed 27 March 2017), Isaac Barnes in household of William Barnes, Civil District 17, Sevier, Tennessee, United States; citing ED 156, sheet 2A, line 13, family 20, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1762; FHL microfilm 1,821,762.]
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.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
William is 21 degrees from Charles Darwin, 21 degrees from Amelia Earhart, 22 degrees from Queen Elizabeth II Windsor and 22 degrees from Gilly Wood on our single family tree. Login to find your connection.