But the gist is, if at least one person who has the photo package is in the actual photo, then that photo is included in the package.
Quellman is right, and because of this, the photo package might actually be a good value for your group since any photo that has a covered person in it is included. There is a 15% discount if you order the "all digital" photo package for one stateroom before you sail. That makes it like $300 for the 7 day cruise. Plus, if you want to add additional staterooms to the package, you can do that once you are on board at 50% off the normal rate (without the 15% discount) so those would be like $150 each. I'm not saying you should do all 9 staterooms, after all, as Quellman said if minor children are in another cabin, they are already included, but if you buy the package for two or three cabins (say the main adults in each family unit) you can probably get almost all of your pictures covered, since one of them or their children will be in almost any combination of photo you care to take. When you divide that cost between all the families, and share the USBs around afterwards, you will end up with a lot of pictures for not too much money.
In addition to poses with the characters, and the formal poses, they also have boarding photos, photographers at several of the dinners (remember to sit next to different people as they often take the pictures in pairs based on who is sitting next to whom), and on
Castaway Cay, both as you come off the ship and later in the water. Plus, if at any time during your trip, you decide you aren't getting enough good photos (you decide what that means for you) you can always cancel your photo package and get a full refund.