I am just now looking at this marriage certificate...my best advice on Alexander, since I am early in researching the Compo's, is to look at Alexander Compo and the Compo's in Ogdensburg, NY, particularly the first ward (Oswegatchie), S. Water and Mechanic St, starting with the 1880 census. Keep an eye out for the names Santo/Santos, which is really St. Onge, and also Wells, which was really Dupuis (Wells in French), and also Cutway (Courtois), LaLone, Bean, LaFlair. These are surnames of people who consistently lived right next door to our ancestors, sometimes in the same houses. THEN, look for these same people in Michigan and some in Wisconsin. Basically, they are French Canadian who migrated from Quebec to Ontario and then jumped around between Northern NY (St. Lawrence, Jefferson, Clinton, Franklin Counties) and Michigan. Between 1880 and 1930, I found that many of the people with these surnames moved back and forth between NY, Ontario, and Michigan. It was not uncommon either for the husbands to take off with the kids and leave the wives living with their parents wondering where they were. I found it twice in my family. Also, marriages splitting up and the kids going in orphanages even though they weren't orphaned.
BTW, the Indian in my family (and many of these French Canadians) is Mohawk, from the St. Regis Mohawk Res 30 mi. from Ogdensburg. It wasn't uncommon for the women to marry Native Americans, and the Natives were trying to pass off themselves as "white". My grandfather always maintained that his great grandmother was kidnapped from a farm in St. Lawrence and dragged off to the reservation and raped by a Mohawk...and she was "kicked out" of her family after she re-appeard in Ogdensburg with her Mohawk children, lol. I believe it, as in all of my research, it seems that there were an awful lot of people getting disowned up in Ogdensburg.