More than 211 census records are available for the DeCoste family, from both 1901 and 1911.
Sample 1901 Antigonish census records about the DeCoste family available from Ancestry.ca:
A DeCoste family household of at least 11 members residing in the district of Antigonish was recorded in 1901. The head of household, Hubert DeCoste, was born in Nova Scotia in 1852. He identified his heritage as French. By 1901, at the age of 48, he had an occupation that was recorded as "Farmer". Hubert's wife was J Mary DeCoste, who was 41 years old. J Mary was born in Nova Scotia in 1859. She also identified her heritage as French. Hubert and J Mary had 9 children, 5 boys and 4 girls. In 1883 their eldest child, a boy named James, was born. Two years later, in 1885, when Hubert was 33 years old and J Mary was 26 years old their second child, this time a daughter, who was named Elizabeth, was born. Then, in 1887, with their two children ages 4 years and 2 years, their third child, J Alexander, was born. In 1901 another daughter, their fourth child and second girl, E Mary, was born. With four other children in the household, their fifth child and third girl, A Margaret, was born in 1892. She was followed by 4 more children: their son Thomas, born in 1894; their son L David, born in 1896; their daughter Harriet, born in 1898; and their son A Joseph, born in 1900. Thus, at the time of the 1901 census, this DeCoste family household was filled with 9 children whose ages were 1, 2, 4, 6, 8, 11, 13, 15, and 17 years.