Your individual photo code (7 characters) can be found on the sign up form or in the publication message that you received in your email after the photos were published in the online store. The photo code is used by one person in one photo shoot. Please ask the photo shoot location for a separate photo form for each sibling.
If another guardian has registered the person whose photos you want to view, please ask this party to grant you the right to order the photos. This can be done directly from the online store.