"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2VW-RQJ : accessed 24 December 2021), Helen Gaffney in household of Mary E Gaffney, Cambridge Ward 3, Middlesex, Massachusetts, United States; citing enumeration district (ED) ED 749, sheet 15B, family 304, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 596; FHL microfilm 1,374,609.
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DNA Connections
It may be possible to confirm family relationships with Helen 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 Helen: