On that family I dont have much in my tree but I just found those children and I will update soon my tree on internet:
LOUIS QUESNEL, b. October 24, 1848, St-Clément-de Beauharnois; d. March 1918, Montreal,Que..
LUCIE QUESNEL, b. October 16, 1843, St-Clément-de Beauharnois
LEANDRE QUESNEL, b. February 3, 1845,St-Clément-de Beauharnois
PAUL QUESNEL, b. October 6, 1846,St-Clément-de Beauharnois
PHILOMENE QUESNEL, b. April 28, 1850, St-Clément-de Beauharnois
you can also see this family in the Canadian 1881 census at LDS :http://www.familysearch.org/Eng/Search/census/household_reco...
I will try to find more about the grandchildren, I'll get back to you soon. Hope that helps.