I am trying to find John McCoy (McKoy) McCoy-4704 and Mary Gadys-1 (likely some form of Geddes). They immigrated to the Ottawa Valley in 1839 or 1840. Mary was born in Armagh and their son James states he is born in Caven Ireland. What is the best sources to search them from. They are listed as C of S. So far I have not bee able to find them. Help would be much appreciated.