"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X4TG-ZXC : accessed 1 June 2019), Marion A La Shomb in household of John J O Conner, Piercefield, Saint Lawrence, New York, United States; citing enumeration district (ED) ED 74, sheet 9B, line 64, family 258, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1642; FHL microfilm 2,341,376.
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It may be possible to confirm family relationships with Marion A. 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 Marion A.: