Canadian Government Understands the needs of their permanent residents and in this regard, CIC has launched a program which is called Super Visa by which an individual can invite their parents or grandparents on a long visit for a family re-unite. Canadian Govt. makes sure if sponsor has arranged for an adequate health insurance policy for his/her parents or grandparents and is qualified to sponsor under this program.
Basically it is a long-Term multiple entry visitor visa for the parents or grandparents of a Permanent resident or Canadian Citizen. Visa is normally granted for 10 years and valid period of stay is 2 years at a time.