"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QJDS-YQW3 : 4 November 2017), Walter Dale Van Dewalker and Mary Elizabeth Heisler, 23 Feb 1925, Woodbury, Iowa, United States; citing reference , county courthouses, Iowa; FHL microfilm 1,451,554.
Census
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MGM5-WRS : accessed 18 July 2020), Elizabeth Heisler in household of Earl Heisler, Maple, Monona, Iowa, United States; citing enumeration district (ED) ED 76, sheet 2B, family 29, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 414; FHL microfilm 1,374,427.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M815-JM4 : accessed 18 July 2020), Mary E Heisler in household of Earl Heisler, Grant, Monona, Iowa, United States; citing ED 84, sheet 8A, line 14, family 108, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 503; FHL microfilm 1,820,503.
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DNA Connections
It may be possible to confirm family relationships with Mary by comparing test results with other carriers of her 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 Mary: