My g-g-grandmother, Mary Purveyance, married Charles Gordon(1816-1863)in Ireland, sailed from Londonderry to N. Am. in 1858, settling in Innisfil Twp., Simcoe Co., Ontario in 1863. Charles died of cholera 3 wks. later on Aug. 27, 1863. There were 4 children, my g-grandfather, Joseph(1844-1932), Matilda(1849-1941), Mary and Catherine. One of Joseph's sons was Samuel.Any help in tracing family back to Ireland would be most welcome.