"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KWWX-QZ3 : accessed 29 December 2016), Joanna M Fiscus in household of Erzie R Fiscus, Ogden, Ogden Township, Champaign, Illinois, United States; citing enumeration district (ED) 10-53, sheet 4A, line 12, family 78, 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 766.
It may be possible to confirm family relationships with Joanna 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 DNA with Joanna: