"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9L7-C1W : 20 January 2015), Martin Obrien in household of John Obrien, Bellville Township, Pocahontas, Iowa, United States; citing sheet 4B, family 70, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,452.
"Iowa State Census, 1905," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:2S8Z-DKV : 22 August 2016), Martin Obrien, Pocahontas, Iowa, United States; citing card #210, State Historical Department, Des Moines; FHL microfilm 1,430,578.
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DNA Connections
It may be possible to confirm family relationships with Martin 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 Martin: