This was written in the Guide for dependants:
Dependant(s)
You, the principal applicant must answer each question on behalf of each of your dependant(s).
Note: Remember that all questions in this section are about your dependant. You must include your spouse or common-law partner, if applicable, and all of your dependent children, and those of your spouse or common-law partner, who are not already permanent residents or Canadian citizens.
You can add up to five (5) dependants in this form (IMM 0008) (PDF, 496.57 KB).
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.
If you have more than five (5) family members, you must complete the Additional Dependants/Declaration (PDF, 424.19 KB) form for each additional family member in order to include everyone in your application.
Note
Important
You must list all family members in your application for permanent residence, whether they are accompanying you to Canada or not. You must also provide details on family members whose location is unknown (including those missing or presumed dead). If you don’t, you will not be able to sponsor family members at a later date if they are not listed on your application.
This was written at the Overview of the guide:
Generic Application Form for Canada (IMM 0008)
Must be completed by the sponsor’s spouse or common‑law partner and his or her dependants aged 18 and over who are in Canada *
Additional Dependants/Declaration (IMM 0008DEP) if applicable.
If you have more than five (5) family members, you must complete the Additional Dependants/Declaration (IMM 0008DEP) form for each additional family member in order to include everyone in your application.
Additional Family Information (IMM 5406)
Must be completed by the sponsor’s spouse or common‑law partner and his or her dependants aged 18 and over who are in Canada *
So, I am confuse