United States Census, 1930, index and images, FamilySearch R Erwin Nickolson in household of Lewis E Nickolson, Carson, Noble, Oklahoma, United States; citing enumeration district (ED) 0008, sheet 4A, family 74, line 11, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1915; FHL microfilm 2,341,649.
United States Census, 1940, index and images, FamilySearch Irwin Nicholson in household of Louis F Nicholson, Ward 1, Des Moines, Des Moines Township, Polk, Iowa, United States; citing enumeration district (ED) 100-28, sheet 6B, family 126, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1193.
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DNA Connections
It may be possible to confirm family relationships with Ralph by comparing test results with other carriers of his ancestors' Y-chromosome or 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 Ralph: