Thanks James. Wondering if you missed answering the first two questions in my list?3.That's if you are using a paid representative or someone else. In this case both forms are required. For the sponsor and the person being sponsored.
If you want to serve as a representative for your parents then one form is enough.
4. ALL PAGES.
1. IMM 5669 - Schedule A: Background/Declaration -
Should I add details about my brother in this form, who is not a dependent of my parents?
2. Biometrics - My parents applied for their Canada Visitor Visa in 2016. They gave their BIOMETRICS then, however I don't know their UCI number. Should I pay the biometric fee as well for my parents?