"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7MS-CG9 : accessed 22 June 2019), Thelma F Petre in household of Simon A Petre, Saginaw, Saginaw, Michigan, United States; citing enumeration district (ED) ED 44, sheet 15A, line 30, family 345, 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 Thelma 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 Thelma: