↑ "United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K42C-3WH : accessed 4 September 2016), Mary Lois Pitre in household of Frederick Pitre, Essexville, Essexville City, Bay, Michigan, United States; citing enumeration district (ED) 9-36, sheet 18A, family 346, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1729.
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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: