"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M92C-8Q4 : accessed 20 March 2018), Iva P Hennagir in household of Silas Hennagir, Mason City Township Mason City Ward 1, Cerro Gordo, Iowa, United States; citing enumeration district (ED) 28, sheet 21A, family 443, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,423.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:ML18-YSS : accessed 20 March 2018), Pearl Hennager in household of Silas Hennager, Mason Ward 1, Cerro Gordo, Iowa, United States; citing enumeration district (ED) ED 29, sheet 12A, family 275, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 396; FHL microfilm 1,374,409.
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DNA Connections
It may be possible to confirm family relationships with Iva 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 Iva: