"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ4N-7LP : 12 April 2016), Leroy 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 LeRoy McMains (5 Dec 1830–4 Jul 1905), Find a Grave Memorial no. 77707922, citing Cambria Cemetery, Cambria, Wayne County, Iowa, USA ; Maintained by Don Bedwell (contributor 46502238) .
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DNA Connections
It may be possible to confirm family relationships with Leroy by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Leroy: