The Super Visa is somewhat of a unique program that Canada runs exclusively for immigrant permanent residents and naturalized Canadian citizens.
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.
Unlike a TRV (Tourist Visa equivalent), ...
You can extend Super Visa, or even an ordinary TRV for parents/grandparents, even without leaving Canada, as long as you meet insurance, health and funds requirements.
There is no absolute reunification against extension for longer time. Like the other answer said, it is the government's way to allow family reunification without paying health costs after the ...
In very broad strokes, trying to outsmart the immigration system of any country does not work. Even we amateurs who answer questions on these SE sites and forum have seen it all, imagine the professionals. More broad rules:
A visa merely allows you to present yourself at the border and ask for entry but it does not entitle you to, well, anything.