Thank you anonymous! I found my that my great grandmother Susanna Cavanagh, b 1851, indeed came from Carlow, so was going to suggest it. Her parents, James and Margaret Cavanagh emmigrated to York in Canada, (now a part of Toronto, Ontario) They are all listed living there in the 1851 census, so I know when they must have come to Canada. I estimated their birth dates as 1816, for James, and 1826 for Margaret, though I still don't know her maiden name. I also need to find out where Susanna's husband, Richard Carney came from. His family settled first in York and then in Goderich. I plan to search the records for Grosse Ile in Quebec which was the port of entry for immigrants for Europe. It was also a quarantine station and many would-be immigrants died there of typhus or had died in transit. My French grandfather's great grand-mother was an orphan from Ireland who was adopted by a Quebecois family, so I'm hoping to find more answers to the saga from the Grosse Ile website. I must also follow the link you provided.