Don't worry about this email. It's just a confirmation mail from VFS staff that they have opened your envelopes and assigned a number to the passport applications. The AWB number would be activated once your parents' passports would be processed (stamped) and sent back by courier to your address.
And the tracking number assigned by VFS, starting with 2020, is for your reference, which will be sent to IRCC in coming days. You can track it on VFS Global website under the track your application tab. You would need to provide this tracking number and date of birth to track the status.
But that status would be sent to you whenever your application moves like from VFS to IRCC office and then back at regular intervals.
You will be getting couple of emails in coming days regarding the same.
All the text of such emails would be confusing, so don't worry about these.
Follow this link for clarifications.
https://www.google.com/amp/s/www.am22tech.com/ca/vfs-message-meaning/?amp
Hope this helps.