Hi
1. Only your immediate family i.e. Spouse & Children can be mentioned on your application as "dependents" and can travel with you.
2. Your parents & siblings cannot travel with your as they are not your "dependents" please check if you have a form IMM 5046 entitled "Additional Family Information" If this form is not included in your application you may not have to provide this information.
Mike
The IMM 5406 has to be completed by everyone applying over the age of 18 it is in every application package.
PMM