Just to clear the confusion up for everyone:
- Initial paper application (IMM 0008) - Question 3 asks "How many family members, including you, are in this application", the answer to this is 1 if it is just yourself, and then +1 for each dependent listed on the form.
- Linking to GCKEY, it asks "Number of family members, including the primary applicant, that are part of this application", this includes your sponsor, so the base number is 2, then +1 for any dependents on your application.
I recently posted the below to our November thread and we've had some positive results with linking: