Thanks Foresters and GKTLondon for your responses, so for chronic diseases should I assume that one will have to spend out of their pockets for medicines? What if the person can't afford them ? Doesn't the government provide any assisstance?

The prescription drug coverage starts at age 65 as far as I know. Until then, you have to cover it and there is no government assistance. For older people who are already taking regular meds (BP, diabetes etc.), it might be much cheaper to get them from India rather than buy them here. There may be some charities that could potentially help, but don't know much about this.

Also, as someone recommended, get them health insurance for the first 3 months until OHIP coverage starts. Even if they are in relatively good health, I think this is a good idea.

Overall, I have found Canada to be one of the most supportive countries when it comes to family reunification. I say this from personal experience. The fact that they can get OHIP coverage in 3 months is nothing short of amazing. That said, it does not (and in my opinion should not) completely absolve us of responsibility, otherwise the system becomes unsustainable (most would argue it already is).

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Are you there?

As I understand the officer cannot refuse you entry into the country at the POE, however they will mention the date you have been away from Canada in your passport next to the entry stamp.
The best way to enter Canada is in a private vehicle across the bridge as you need a PR card to enter only if you are arriving in Canada on a comercial mode of transport ( air, rail, ship, bus )