Are your parents visiting Canada as a visitor. You need to take care of following:
SUPERVISA
A super visa lets you visit your children or grandchildren for up to 2 years at a time. It’s a multi-entry visa that provides multiple entries for a period up to 10 years.
You parent or grandparent of a Canadian citizen or a permanent resident of Canada
have medical insurance from a Canadian insurance company that is:
valid for at least 1 year from the date of entry
at least $100,000 coverage
have proof that the medical insurance has been paid (quotes aren’t accepted)