Have you found that marriage record for your grandparents yet? If not, give me their names and I'll see if I can find it.
I'm no longer "worried" about Melazie's age! In 1880 she was apparently older than 40 [having been born in 1840]. I found the marriage record for her and Joseph Cormier. The marriage took place on 7/3/1849 and there is no way [at least I hope not] that she was nine years old when she married. She is listed as Melasie Royer.
I had not found anything on Modeste who married Edmond Carothers. I now know that she was Modeste Comeaux daughter of Michel Comeau, III and Magdeleine LaComb. This couple married on 8/6/1834. I found them on the 1860 and 1870 census records for St. Landry [Opelousas]. They had at least 8 children.
Michel Comeaux is shown as the III. I found a marriage record for his father, Michel,fils [son]. He married Marie-Louise Latiolais on 12/3/1800. The younger Michel was born ca 1808 according to both census records.
All these Acadian lines can be traced back to Nova Scotia and then to France. My friend recently visited Nova Scotia. She and her husband visited all the places where their ancestors had lived. It was a trip of a lifetime.