It is against Disney policy to download the photos of people you are not traveling with. The policy states that they can delete all your photos and your account if you do this. It is intended for your use only.
If you are traveling with them, then you will have to add them to your family and friends list. I'm not sure if there is a way to not have access to their fp/reservations, but it is just an option. You wouldn't have to manage their fp/reservations.