"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7MS-VNP : accessed 30 July 2017), Lorraine M Petre in household of Herbert A Petre, Saginaw, Saginaw, Michigan, United States; citing enumeration district (ED) ED 46, sheet 19B, line 80, family 488, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1022; FHL microfilm 2,340,757.
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It may be possible to confirm family relationships with Lorraine 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 Lorraine: