Do you have birthdates for them? I found an Andrew Emberson b abt 1822 in Wisconsin and another b abt 1824 in Iowa. Of course, if they went to Canada, these aren't him!
Thank you for your answer but I do not think it will match. Sorry for answering so late. I think they lived in Saint-Pierre et Miquelon as they have had a daughter there. But I do not have any birthdate.