I am looking for information on a Marg Irwin who came to Canada about 1847 with her daughter Mary ( b abt 1811), sons William and Thomas. She was widowed when she arrived in Canada. They settled in the Chatham Ontario area. Descendants of Thomas still live in the area. Would apprecate any help, as we can find no information on this family prior to coming to Canada. They are suppose to have come from the Armagh area of Ireland.