When Marguerite Sarasin was born in 1721, in Lachine, Montreal, Lower Canada, British Colonial America, her father, Pierre Sarrazin Depelteau, was 37 and her mother, Marguerite Leduc, was 25. She married Joseph-Marie Lalonde on 10 January 1752, in Lachine, Montreal, Quebec, Canada. They were the parents of at least 5 sons and 2 daughters. She died on 23 July 1763, in Soulanges, Quebec, Canada, at the age of 42, and was buried in Les Cèdres, Vaudreuil-Soulanges, Quebec, Canada.