"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M65X-DJV : 9 November 2014), Martha A Clayton in household of Francis H Clayton, Marshall county, Marshall, Kentucky, United States; citing family 410, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
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It may be possible to confirm family relationships with Martha 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 (beta) of DNA with Martha: