Found this record on familysearch: Michael Gibson married Margaret Mahoney on 14 May 1903 Manhattan, New York.
States that Michael's parent's are Jas (James) Gibson and Delia Lynch of Ireland
States that Margaret's parent's are Martin Mahoney and Hanna O'Connor of Ireland
I don't believe the parents came over to the US... not sure, though.
Now... the Michael Gibson and Margaret ? that I know did have three children, James 1904 New York, Hanna 1905-06 New York and Margaret 1912 New York. There was another child between Hanna and Margaret.