Supervisa for parents and airplane tickets

[tetra]

Where I can find the information regarding 2way or 1 way ticket for my parents that want to stay 2 years? It is impossible to book the flight back in 2 years.
so far i couldn't find this info
peoples have different opinion about it.
Thank you

 

[truesmile]

We booked it for 6 months knowing we will change it when the time comes.

 

[tetra]

I think you can't keep changing it up to 2 years. I am going to apply to permanent residence for them now. So they are not leaving Canada. I want to buy expensive tickets so if i buy them just 1 way I will save a couple thousand of dollars. But I have to be sure that 1 way ticket is allowed.