Hey guys thanks for the responses.

So I called jet airways and air India and received more info;

Jet airways
- when I called the call centre the gentleman said that if I were to book the flights at the call centre by paying $ US or CAD then my parents would be allowed 2 pieces of luggage at 23kg each. However I couldn't find any corroborating information on Jet's website. Not sure if the guy was taking me for a ride or not.
fare; $135 one way all in

Air india
- cheapest economy fare - entitled to 15kg and anything over is charged 250 rupees per kg. there was a higher economy class fare available which increased allowance by 5 kg to 20kg
Total fare; $CAD 257 for cheapest economy and $287 for higher economy.

Best option would be jet but not sure how accurate the guys info was.