"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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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: