Agnes was born in 1769. She was the daughter of John Giffin and Eleanor Heron. She passed away in 1855.
From History of Westmoreland County:
Agnes born March 26, 1769 married Fergus Smith March 25, 1794.
Sources
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4C9-THB : 12 April 2016), Nancy Smith in household of Forgal Smith, Cool Spring, Mercer, Pennsylvania, United States; citing family 1239, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.). Apparently in Scotch-Irish families the names Nancy is used as a nickname for Agnes.
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DNA Connections
It may be possible to confirm family relationships with Agnes by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Agnes: