Mary was born in 1780. Mary Cox ... She passed away in 1831.
Sources
"Tennessee, County Marriages, 1790-1950," database with images, FamilySearch (https://familysearch.org/ark:/61903/3:2:77TV-BFD1?cc=1619127 : 29 November 2018), > image 1 of 1; citing Tennessee State Library and Archives, Nashville and county clerk offices from various counties.
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DNA Connections
It may be possible to confirm family relationships with Mary 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 Mary: