James Harrigan and Kate Callahan from Co. Cork to Nashua, NH USA

Looking for my great-grandparents James Harrigan and Kate L. Callahan both of County Cork.

James born abt 1868

Kate born abt 1866

married May 25 1892 in Nashua, NH USA

daughter Lillian M. born 1/24/1893 in Nashua, NH USA

possibly another daughter Ellen or Helen born 1896.

Neither James, Kate or Ellen/Helen are on the 1900 census.  My grandmother Lillian told me that she was orphaned at 3 years old, was raised by family and went into domestic service at an early age.  Lil married Harold B. Wellman 10/6/1923 in Nashua.  They had 2 daughters Grace Katherine 10/12/1929 - Jan 1989 no children and Ann Marie 5/20/1931 - 3/11/1984.  My mother, Ann married Donald R. Hardy 4/14/1951 in Nashua.

Any help will be greatly appreciated.