"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8QF-VZ7 : 12 April 2016), John Mckay, Darlington county, Darlington, South Carolina, United States; citing family 733, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"South Carolina Deaths, 1915-1965," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N9J8-JRW : 5 April 2018), John Mckay in entry for William Alexander Mckay, 18 Mar 1922; citing , Mckay, William Alexander, 1922, Department of Archives and History, State Records Center, Columbia; FHL microfilm 1,913,611.
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DNA Connections
It may be possible to confirm family relationships with John by comparing test results with other carriers of his Y-chromosome or his mother's 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 John: