John was born in 1857. He was the son of John Mercer and Rose Bradley. He passed away in after 1860.
Sources
"United States Census, 1860," database with images, FamilySearch, accessed 16 October 2021, John M Mercer in the household of John Mercer, Grayson County, Kentucky, FHL film #005169951, image 36 of 186; from "1860 U.S. Federal Census - Population," database, Fold3.com (http://www.fold3.com : n.d.); citing NARA microfilm publication M653 (Washington, D.C.: National Archives and Records Administration, n.d.).
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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 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 John: