I advise you to submit IMM0008 form to reply Aug, 1st 2019 CIC request to Include father in the application.
If CIC asking you to include father in the application.>> you have to just follow CIC instruction and include your dad as dependent section in IMM0008.
also in guide 5772 ( check blue text)
Dependant(s)
You must answer each question on behalf of each of your dependant(s).
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 five (5) dependants using this form.
If you have more than five (5) dependants:
To include everyone in your application you must complete the following form for each additional family member:
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 these family members are not listed on your application, you will not be able to sponsor them at a later date.
Dependant’s Personal Details
Questions 1-9
Questions 1 to 9 are the same questions you answered for yourself. See the
previous instructions to help you answer the questions for your dependant(s).
Question 10
- From the list, select your dependant’s relationship to you, the principal applicant:
- Adopted Child
- Child
- Common-law partner
- Grandchild
- Other
- Spouse
- Step-Child
- Step-Grandchild
- Complete if you select “Other”
Question 11
- Select the box to tell us if your dependant will accompany you to Canada.
- If you answered “No”, explain why your dependant is non-accompanying.