More than 21 census records are available for the McIssac family, from both 1901 and 1911.
Sample 1901 Inverness census records about the McIssac family available from Ancestry.ca:
A McIssac family household of at least 4 members residing in the district of Inverness was recorded in 1901. The head of household, Donald McIssac, was born in Nova Scotia in 1806. He identified his heritage as Scotch. By 1901, at the age of 95, he had an occupation that was recorded as "Farmer". Donald's wife was Rachael McIssac, who was 70 years old. Rachael was born in Nova Scotia in 1831. She also identified her heritage as Scotch. Donald and Rachael had 2 children, a boy and a girl. In 1863 their eldest child, a girl named Mary, was born. Eight years later, in 1871, when Donald was 65 years old and Rachael was 40 years old their second child, this time a son, who was named Kanneth, was born.