Based on the assumption that Elizabeth (Duncan) Coates appears in the 1860 census with a birth date of 1790, her father would likely have been born in 1770 or earlier.
Sources
"United States Census, 1860," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCLG-Y2B : accessed 5 July 2015), Elzabeth Coats in household of John Coats, Salisbury Township, Meigs, Ohio, United States; from "1860 U.S. Federal Census - Population," database, Fold3.com (http://www.fold3.com : n.d.); citing p. 50, household ID 358, NARA microfilm publication M653 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 805,008.
Is Unknown your ancestor? Please don't go away! Login to collaborate or comment, or contact
the profile manager, or ask our community of genealogists a question.
Sponsored Search by Ancestry.com
DNA Connections
It may be possible to confirm family relationships with Unknown 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 Unknown: