I don't have more information on Constant or Ernest. I have a couple named Joseph and Marguerite St-Sauveur, but they were married in 1777. They had 13 children and I don't have any Constant among them. These children married in the Laprairie area, which is not far from Ontario, though. The Constant we are talking about had his children around 1880s so it surely is not the same. Can you tell me more about your line. As I understand you're a descendant of John and Marie Bellemarre? I will check with Claude Carriere's web site to see if I find something else on Constant. If you don't mind, send me your e-mail so we can keep in touch.