"New York Marriages, 1686-1980," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F6WM-Y7Q : 12 December 2014), Michael J. O'Brien and Margaret Johanna Malone, 27 May 1872; citing reference ; FHL microfilm 1,561,850.
"New York, New York City Births, 1846-1909," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:27BV-XDN : 20 March 2015), Michael O'Brien in entry for O'Brien, 29 Jun 1873; citing Manhattan, New York, New York, United States, reference cn 113060 New York Municipal Archives, New York; FHL microfilm 1,322,065.
"New York, New York City Municipal Deaths, 1795-1949," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2WFB-98Q : 20 March 2015), Michael S. O'Brien in entry for William S. O'Brien, 29 Mar 1909; citing Death, Brooklyn, Kings, New York, United States, New York Municipal Archives, New York; FHL microfilm 1,324,186.
"Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVVB-8NS8 : 13 December 2015), Michael John O'Brien, 1906; Burial, Brooklyn, Kings (Brooklyn), New York, United States of America, Holy Cross Cemetery; citing record ID 26603277, Find a Grave, http://www.findagrave.com.
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DNA Connections
It may be possible to confirm family relationships with Michael 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 Michael: