"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDX2-X9R : 14 August 2017), Mary F Williamson in household of S D Williamson, Vernon, Louisiana, United States; citing enumeration district ED 47, sheet 102D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0473; FHL microfilm 1,254,473.
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It may be possible to confirm family relationships with Mary by comparing test results with other carriers of her ancestors' 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: