More than 14 census records are available for the LeDuc family, from both 1901 and 1911.
Sample 1901 Argenteuil census records about the LeDuc family available from Ancestry.ca:
A LeDuc family household of at least 4 members residing in the district of Argenteuil was recorded in 1901. The head of household, Philias F LeDuc, was born in Quebec in 1869. He identified his heritage as French. By 1901, at the age of 31, he had an occupation that was recorded as "Farmer". Philias's wife was Marguerite LeDuc, who was 25 years old. Marguerite was born in Ontario in 1876. She also identified her heritage as French. Philias and Marguerite had 2 children, a boy and a girl. In 1896 their eldest child, a girl named Marie, was born. One year later, in 1897, when Philias was 28 years old and Marguerite was 21 years old their second child, this time a son, who was named Télesphore, was born.