I don’t know if the following people are the ones you’re looking for but it’s worth a try. I have a large database on the Désilets family, about 3000 couples. In it, I have only one Médéric because it’is a very rare name in Quebec. He married Azilda Dulong in 1881. I have no information on any children for them, which means that they didn’t have any that grew old and married or means that the whole family moved out of Quebec early after the marriage and left no traces here. Here’s my data:
Médéric Désilets (Alexis Désilets & Magné Jarret dit Beauregard) m 26-04-1881 Chertsey (Montcalm co), St-Théodore church Azilda Dulong (Lambert Dulong & Marguerite Dupuis)
Without any apparent connection, I also have sketchy information on a Pauline Désilets married to Antonio Blanchard in St-Joseph (I don’t know which St-Joseph), on 9 Oct 1948. Pauline’s parents are said to be Henri Désilets and Marie-Anne Boucher.
In this case, I have no other couple in my data named Henri Désilets and Marie Boucher. Could this Pauline be an aunt of yours? If the above Médéric should be the right one, I can provide 7 more generations on his line.