My Cassidy family originally came from Boho in Fermanagh. My grandfathers grandfather was one of 4 Cassidy brothers. Three of the brothers(Thomas, Edward and Philip,) were convicted (?) and sent to Australia as convicts in 1830. I know they left behind a brother, James, who may of emigrated to Canada or US. In addition I have read that it is believed that Edward returned to Ireland and then emigrated to Canada under an assumed name but I have no confirmation regarding this.
My great great grandfather was Thomas.