I am researching Gannons in Canada. Most of the family I have found settled in Montreal. My gg grandfather was Thomas Gannon from Westport Ireland, married to Mary Ford. Their son Dennis Joseph Gannon from Manchester, married Mary Moran, a Canadian in 1866 in Quebec, Canada where they raised their family. I would like to know if this Dennis had any brothers or sisters, or relatives in Quebec, Ontario or possibly Detroit Michigan.