More than 69 census records are available for the LeDuc family, from both 1901 and 1911.
Sample 1901 Saint-hyacinthe census records about the LeDuc family available from Ancestry.ca:
A LeDuc family household of at least 11 members residing in the district of Saint-hyacinthe was recorded in 1901. The head of household, Misaêl LeDuc, was born in Quebec in 1856. He identified his heritage as French. By 1901, at the age of 44, he had an occupation that was recorded as "Farmer". Misaêl's wife was Henriette LeDuc, who was 37 years old. Henriette was born in Quebec in 1863. She also identified her heritage as French. Misaêl and Henriette had 9 children, 3 boys and 6 girls. In 1884 their eldest child, a boy named Misaêl, was born. One year later, in 1885, when Misaêl was 29 years old and Henriette was 22 years old their second child, this time a daughter, who was named Alfreda, was born. Then, in 1887, with their two children ages 3 years and 2 years, their third child, Eva, was born. In 1901 another daughter, their fourth child and third girl, Alda, was born. With four other children in the household, their fifth child and fourth girl, Autoindt, was born in 1892. She was followed by 4 more children: their daughter Albina, born in 1894; their son Pierre, born in 1896; their daughter Anna, born in 1898; and their son Arthur, born in 1900. Thus, at the time of the 1901 census, this LeDuc family household was filled with 9 children whose ages were 1, 2, 4, 6, 8, 10, 13, 15, and 16 years.