I have a database on the Desilets family. I have not found where Henri Désilets & Mary Alphonsine Desfossés married but I assume it was in MA where she was born. This couple settled in Lynn, MA. I got the name of Henri's parents from a Ms Reardon who may be a descendant.
I'll e-mail you what I have on this whole Desilets line.
Please note that the Desilets surname was "created" in Quebec and that the ancestor coming from France was Antoine Desrosiers.