"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:3S65-1N2 : accessed 3 July 2018), Helen S Yeats in household of Walter L Yeats, Shiloh, Carroll, Georgia, United States; citing enumeration district (ED) ED 31, sheet 8A, line 32, family 163, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 343; FHL microfilm 2,340,078.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K72T-P1B : accessed 3 July 2018), Nell Yates in household of Lonnie Yates, Burwell, Militia District 1371, Carroll, Georgia, United States; citing enumeration district (ED) 22-34, sheet 10B, line 56, family 197, 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 647.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JPV9-4YZ : 19 May 2014), Helen Todd, Mar 1986; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
Find A Grave, database and images (https://www.findagrave.com : accessed 03 July 2018), memorial page for Helen Nell Yates Todd (30 Oct 1923–6 Mar 1986), Find A Grave Memorial no. 75285783, citing Salem Baptist Church Cemetery, Carroll County, Georgia, USA ; Maintained by Helen Delores Moore (contributor 47624618) .
It may be possible to confirm family relationships with Helen 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 DNA with Helen: