@Paul09 Thanks for the response!You have mentioned that your parents are traveling back to India on Mar 22nd, If that's correct do not send their passports to Ottawa. Just go with the plans you have and use the same letter to send passports to NDVO once they reached India.
Not sure what address you have given them, but I would say, do not make any changes now. Once they received their passport back make sure they come back before their Immigration visa expires to complete the landing process at the airport.
Yes, my parents are travelling back to India on Monday. Permanent address on the application is an Indian address but current address is a Canadian address since they have been in Canada for over 2 years now. When my parents go to India, do I have to inform CIC of the address change? Will that impact their application? or should I just send the passports for stamping?