"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3B3-T8K : accessed 18 November 2017), Nicholas O Neill in household of Thomas K O Neill, Leo Valley, Logan & O'Connor Precincts, Greeley, Nebraska, United States; citing enumeration district (ED) 109, sheet 7A, family 111, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,928.
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DNA Connections
It may be possible to confirm family relationships with Nicholas 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 Nicholas: