More than 10 census records are available for the McDermaid family, from both 1901 and 1911.
Sample 1901 Kings (Prince Edward Island) census records about the McDermaid family available from Ancestry.ca:
A McDermaid family household of at least 5 members residing in the district of Kings (Prince Edward Island) was recorded in 1901. The head of household, Hugh McDermaid, was born in Prince Edward Island in 1846. He identified his heritage as Scotch. By 1901, at the age of 54, he had an occupation that was recorded as "Farmer". Hugh's wife was Sarah McDermaid, who was 48 years old. Sarah was born in Prince Edward Island in 1853. She also identified her heritage as Scotch. Hugh and Sarah had 3 children, a boy and 2 girls. In 1880 their eldest child, a girl named Bella, was born. Three years later, in 1883, when Hugh was 37 years old and Sarah was 30 years old their second child, this time a son, who was named Robert, was born. Then, in 1885, with their two children ages 5 years and 2 years, their third child, Katie, was born. Thus, at the time of the 1901 census, this McDermaid family household was filled with 3 children whose ages were 15, 17, and 20 years.