"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M815-JM8 : accessed 18 July 2020), Elmer O Heisler in household of Earl Heisler, Grant, Monona, Iowa, United States; citing ED 84, sheet 8A, line 18, 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 Elmer by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Elmer: