"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KWZ5-KZ1 : 8 January 2021), Violet Marshall in household of Everette Marshall, South Winchester Election Precinct, Scott, Illinois, United States; citing enumeration district (ED) 86-24, sheet 1A, line 20, family 6, 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 889.
"Illinois Deaths and Stillbirths, 1916-1947," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N3W8-55J : 9 March 2018), Viola Marshall, 10 Aug 1943; Public Board of Health, Archives, Springfield; FHL microfilm 1,983,459.
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DNA Connections
It may be possible to confirm family relationships with Viola 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 Viola: