I have found the Demers-Laramée marriage: In Belleville, Ontario, parish St. Michael the archange, 9 July 1860.No mentions about parents. Witnesses:Francis Boie and Rose Allice Pacette?? (Paquette).
You can have this marriage in searching in familysearch.org databases. Ontario, Roman Catholic Church Records, 1760-1923 Hastings Belleville St Michael the Archangel Baptisms, marriages 1835-1870 Page 86.