Thank you so much for your reply and the links. I do have a bit more information that could be useful. John and Margaret had one child, William, who was born in Ireland in 1824. I know this from William's obituary and United States death index (he lived in Bloomington, Illinois in his later life as did his brother, my great-great-grandfather, James Gilwee. The next child born to John and Margaret that I am aware of is Sarah, born in 1827 in Montreal. I found a record that places John in Ottawa, Ontario in 1829, which substantiates what I was told by a distant relative that John immigrated to Canada to work on the Rideau Canal. I do not know if that was the original reason, but it seems he did end up there. I bought a book on the building of the canal and it said that 500 men, mostly Irish, died building the Rideau Canal. So awful and so sad. It is however, quite an amazing achievement.
Anyway, in the record it says that John reported himself as being from Ballykilcash?, Sligo. I have also heard they were from Dromore West. This record also indicated that he had a brother, Patrick who in 1829 was still living in Ballykilcash?. It was said that John was "known to Rev. William Grove".
i hope this information is helpful. Anything addition informaton would be greatly appreciated.
Kindest Regards,
Patty Harrington