"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZWR-93T : accessed 30 September 2017), David Y Peters, Detroit Ward 16, Wayne, Michigan, United States; citing ED 489, sheet 3B, line 55, family 45, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 814; FHL microfilm 1,820,814.
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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: