Thanks for your suggestions and I agree with you but nobody knows how IRCC would handle applications for extension just based on PHAC that too ones without biometric, in case if application doesn't get approved then getting new TRV from India would so difficult in current time considering present situation in India. I am looking to know if one can apply for new TRV while inside Canada based on 6 month visitor status in Canada ....like in my case 6 month visitor status for my parents expires on August 4th, they have return ticket booked for July 25th, So I wonder if I can submit new TRV application before July 4th ?