This has to be completed by the Principle Applicant. There is no such requirement of having over 5 dependents.
@legalfalcon .... Sir no offense, but I am sharing the link for
Generic Application Form for Canada (IMM 0008)
When we scroll down to the middle of the page for DEPENDANT Section, it is written as verbatim:
Dependant(s)
You must answer each question on behalf of each of your dependants.
To add a new dependant to the application, click the “Add Dependant” button, located at the bottom of the page.
To remove a dependant from the application, click the “Remove Dependant” button.
You can add up to 5 dependants using this form.
If you have more than 5 dependants:
To include everyone in your application, you must complete the following form for each additional family member:
https://www.canada.ca/en/immigration-refugees-citizenship/services/application/application-forms-guides/complete-0008-5669.html#details
Sir need your guidance to remove the confusion.