Scotland Census, 1881," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KMXB-5JY : 11 December 2017), Mary Griffin, West Calder, Midlothian, Scotland; from "1881 England, Scotland & Wales census," database, findmypast (http://www.findmypast.com : 2012); citing p. 5, PRO T 1, The National Archives, Kew, Surrey; FHL microfilm 224,024.
United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3WS-Z24 : accessed 6 October 2015), Mary Griffin in household of George Griffin, Philadelphia city Ward 21, Philadelphia, Pennsylvania, United States; citing sheet 2B, family 31, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,463.
United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQW1-6YX : accessed 6 October 2015), Mary Griffin, Ward 21, Philadelphia, Philadelphia City, Philadelphia, Pennsylvania, United States; citing enumeration district (ED) 51-394, sheet 1A, family 2, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 3699.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNMN-7MV : accessed 6 October 2015), Mary Griffin in household of Dennis Dellenport, Philadelphia Ward 21, Philadelphia, Pennsylvania, United States; citing sheet 3A, family 34, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,821,617.
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DNA Connections
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: