Gardiner Family of Gorwan

My great grandmother, Mary M Gardiner was born in Gorwan in 1875 and left for New York City in 1895.  She married John Henry Kane in 1898, and they lived in Brooklyn, where John H Kane worked as a printer.  The family moved to Princeton, New Jersey--the town where John H Kane had grown up--after the birth of their second child in 1905.  Their first child, Daniel Walter Kane, was my grandfather.  I believe that Mary Gardiner's parents were James Gardiner and Margaret Holohan, and that some of Margaret Holohan's brothers and sisters--and perhaps her parents--left for America in the 1860s.  Would welcome any additional information--or suggestions on where to search next.