+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
You can apply for visitor visa now. There was a ban on direct flight. India to Canada travel was always open via 3rd countries.

Hope this helps.
 
For proof of relationship between applicant (parents) and PR, is passport page sufficient stating parents name? Or is birth certificate mandatory as well?