Wife was Sarah (1798 - ) birth date unknown. According to his sons 1900 Census record he was born at sea. Some records list him as being born in Pennsylvania, and some in Ireland, so its possible that he was born en route while his mother was en rout from Ireland to Pennsylvania.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSXJ-PSL : accessed 13 April 2018), James O Long in household of Lafayette L Long, Election District 3 Buffalo city Ward 24, Erie, New York, United States; citing enumeration district (ED) 204, sheet 13B, family 258, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,032.
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