"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6DS-3LR : 12 April 2016), Mary Stephens in household of J H Stephens, Darien, Fairfield, Connecticut, United States; citing family 155, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFC6-K1J : 12 August 2017), Mary J Stevens in household of John H Stevens, Darien, Fairfield, Connecticut, United States; citing enumeration district ED 151, sheet 272B, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,096.
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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: