"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2KV-CVC : accessed 19 December 2016), Margaret Mellon in household of Edward Mellon, Boston Ward 5, Suffolk, Massachusetts, United States; citing enumeration district (ED) ED 1316, sheet 6A, family 97, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 615; FHL microfilm 1,374,628.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFM8-WSC : accessed 19 December 2016), Margaret Mellen in household of Margaret Mellen, Boston Ward 3, Suffolk, Massachusetts, United States; citing enumeration district ED 70, sheet 7A, line 32, family 173, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 729; FHL microfilm 1,820,729.
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DNA Connections
It may be possible to confirm family relationships with Margaret 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 Margaret: