More than 84 census records are available for the Desrosier family, from both 1901 and 1911.
Sample 1901 Joliette census records about the Desrosier family available from Ancestry.ca:
A Desrosier family household of at least 8 members residing in the district of Joliette was recorded in 1901. The head of household, Joseph Desrosier, was born in Quebec in 1860. He identified his heritage as French. By 1901, at the age of 41, he had an occupation that was recorded as "Farmer". Joseph's wife was Délia Desrosier, who was 31 years old. Délia was born in Quebec in 1869. She also identified her heritage as French. Joseph and Délia had 6 children, 3 boys and 3 girls. In 1891 their eldest child, a girl named Rosea, was born. Two years later, in 1893, when Joseph was 33 years old and Délia was 24 years old their second daughter, who was named Antoinette, was born. Then, in 1895, with their two older daughters ages 4 years and 2 years, their third daughter, Albertine, was born. Joseph and Délia's first son was born in 1897 and was named Joseph. With four other children in the household, their fifth child and second boy, Onesiphor, was born in 1899. He was followed by 1 more child: their son Hermidas, born in 1901. Thus, at the time of the 1901 census, this Desrosier family household was filled with 6 children whose ages were (infant), 2, 4, 6, 7, and 9 years.