"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MX3L-LYB : 12 April 2016), William Harris in household of Elizabeth Harris, Tate, Clermont, Ohio, United States; citing family 1131, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"Ohio Deaths, 1908-1953," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X8NH-S9M : 9 March 2018), Archabald Harris in entry for William Harris, 25 Oct 1916; citing Tate, Clermont, Ohio, reference fn 60221; FHL microfilm 1,983,756.
Find A Grave, database and images (https://www.findagrave.com : accessed 30 June 2018), memorial page for William T. Harris (10 May 1840–25 Oct 1916), Find A Grave: Memorial #175333103, citing Tate Township Cemetery, Bethel, Clermont County, Ohio, USA ; Maintained by S. Mac (contributor 48037773) .
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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.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: