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"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M37Y-617 : accessed 7 January 2021), Mary E Barth in household of Frank F Barth, Philadelphia city Ward 21, Philadelphia, Pennsylvania, United States; citing enumeration district (ED) 453, sheet 1A, family 6, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,462.
"United States Census, 1910," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MG7Q-DPG : accessed 7 January 2021), Marie Janson in household of Wm Janson, Philadelphia, Philadelphia, Pennsylvania, United States; citing enumeration district (ED) ED 385, sheet 2A, family 31, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1395; FHL microfilm 1,375,408.
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It may be possible to confirm family relationships with Marie 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 Marie: