"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MV9G-LL5 : accessed 2 October 2017), George Case, Oneonta, Otsego, New York, United States; citing ED 212, sheet 2B, line 66, family 42, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1255; FHL microfilm 1,821,255.
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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: