James Henry Guckian and his wife Katherine Hanley came to the U.S. from Carrick on Shannon, Co. Leitrim, Ireland about 1849. They had two daughters while living in Ireland: Jean, born 1846 and Celia, born 1847. When James and Katherine were listed on the 1850 census in Rochester, New York, their last name had been changed to Hackett; their daughter Jean was not with them; and they had a new son, James Henry Hackett, born 4 May 1850.
It is not known what happened to Jean. She may have died before they left Ireland, on the voyage over or after they arrived in the U.S.