Marie Casavant and Narcisse Beauregard,1848, Saint-Hyacinthe appear in the book "mariages des Descendants de Jean Casavant de 1681 @1950". The book is by Germain Casavant et Marie-Jeanne Laplante/Casavant.
Listed in this book the marriages dates and places of some or all the siblings. Also listed are many mariages of ancestors,nieces and nephews,grand nieces and grand nephews etc..
At a quick glance i see that Antoine Casavant and Rosalie Praires were her parents. i will look further. If so Antoine was elected to the Quebec legislation assembly in1881 to 1886.