There is a family in St-Paul l'Ermite, L'Assomption, Qc which could be the one you are looking for...
By the way, Repentigny is right next door to St-Paul l'Ermite, which is now part of Le Gardeur.
Amable MAZURET dit LAPIERRE (Amable & Marguerite Payet dit St-Amour)
Mar.: 27 Jan 1840 Repentigny, L'Assomption, Qc
Charlotte JANNOT/JEANNOT dit BELHUMEUR (Joseph & Charlotte Bougret dit Dufort)
Joseph MAZURET dit LAPIERRE, born & bapt. 2 Apr 1847 Saint-Roch-de-l'Achigan, L'Assomption, Qc
In the 1861 Canadian Census of St-Paul l'Ermite, L'Assomption County, page 13 - starting at line 20 (source...
http://interactive.ancestry.com/1570/4108814_00144/794127108...)
You will find:
- Amable MAZURET age 43
- Charlotte JEANNOT, his wife, age 44
- Marguerite PAYET, his mother, age 68
and his children:
- Amable MAZURET, son, age 20
- Philomène MAZURET, daughter, age 18
- Joseph MAZURET, son, age 14
- Justine MAZURET, daughter, age 12
- Elise MAZURET, daughter, age 9
- Louis MAZURET, son, age 7
- Célina MAZURET, daughter, age 3
His sons, Amable and Louis, as well as daughter Célina, will later marry and settle in St-Paul l'Ermite.
Son Joseph, age abt 24 in 1871, is no longer found living in Lower Canada, according to the Canadian Census.
Note the similarity in the date of birth: April 2nd concords, but the year is different 1847 instead of 1838.
Death certificates are often incorrect, as the person reporting the family data is ofter misinformed, or only knows part of it.