"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ4N-7LG : 12 April 2016), Nancy Mcmains in household of Alexander Mcmains, Mahaska county, part of, Mahaska, Iowa, United States; citing family 815, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
Find a Grave, database and images (https://www.findagrave.com : accessed 14 May 2020), memorial page for Nancy Griffin McMains (15 Apr 1813–21 Sep 1892), Find a Grave Memorial no. 45577800, citing Derby Cemetery, Derby, Lucas County, Iowa, USA ; Maintained by Skip (contributor 46976613) .
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DNA Connections
It may be possible to confirm family relationships with Nancy 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 some percentage of DNA with Nancy: