"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XCMV-HPL : accessed 27 Jul 2014), Mae H Olson in household of Lenord J Olson, School District 078, Dawson, Montana, United States; citing enumeration district (ED) 0044, sheet 1B, family 11, NARA microfilm publication T626, roll 1254.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VBQQ-L9Q : accessed 9 October 2016), Mae Olsen in household of Leonard Olsen, School District 4 Libby, Lincoln, Montana, United States; citing enumeration district (ED) 27-6, sheet 12A, family 261, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 2223.
Source: S555 John and Anna Thea Olson, Aileen Whiteside
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DNA Connections
It may be possible to confirm family relationships with May 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 May: