One site says this:
These are the study permit requirements for children who are accompanying a parent(s) or legal guardian(s) who will study or work temporarily in Canada:
Pre-school/Kindergarten: no study permit required.
Primary and secondary school (age 6-18): open study permit required. You do not require an acceptance letter from the child’s school in Canada. Please note: children accompanying parents who are visitors in Canada (ie. they do not have a study or work permit) are not eligible for an open study permit.
OR
Another says this
Exceptions: Studying without a study permit
In some cases, minor children do not need a study permit to study in Canada. These cases include:
minor children attending kindergarten;
minor children who are refugees or refugee claimants, or whose parents are refugees or refugee claimants; and
minor children who are already in Canada with parents who are allowed to work or study in Canada, and who want to attend pre-school, primary or secondary school.
These are the study permit requirements for children who are accompanying a parent(s) or legal guardian(s) who will study or work temporarily in Canada:
Pre-school/Kindergarten: no study permit required.
Primary and secondary school (age 6-18): open study permit required. You do not require an acceptance letter from the child’s school in Canada. Please note: children accompanying parents who are visitors in Canada (ie. they do not have a study or work permit) are not eligible for an open study permit.
OR
Another says this
Exceptions: Studying without a study permit
In some cases, minor children do not need a study permit to study in Canada. These cases include:
minor children attending kindergarten;
minor children who are refugees or refugee claimants, or whose parents are refugees or refugee claimants; and
minor children who are already in Canada with parents who are allowed to work or study in Canada, and who want to attend pre-school, primary or secondary school.