"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XC6W-YX1 : accessed 8 October 2019), Betty M Petre in household of Leo Petre, Ontario, San Bernardino, California, United States; citing enumeration district (ED) ED 45, sheet 11A, line 40, family 261, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 188; FHL microfilm 2,339,923.
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DNA Connections
It may be possible to confirm family relationships with Betty 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 Betty: