1. the application is only for those who seek PR. your wife isn't your dependent on the application because she is not applying for a PR. it is only you who applies. thus, only you should fill out the forms, only you should provide your documents and your photo. however, in the family information form 5406 you indicate all your family member and their information as asked, including your spouse
2. your bother can't be your dependent in this PR application. he is not eligible for PR. you dont include him in the application. however, in the family information form 5406 you indicate all your family member including their information as asked, including your brother