Welcome aboard, Natalie! Your family will love setting sail on the Disney Dream this spring! I'm glad you're considering the photo cd package from Shutters, as it's a great way to save all of your memories.
When my family sailed on the Disney Dream with my parents and brother, we had three staterooms and our reservations were linked, as yours will be. Anytime we had a photo taken, we tried to use just one of our Key to the World cards, to ensure the photos would show up in the same group. There were a few times when we visited
Shutters and found one of my kids' photos in my brother's stateroom album or vise versa. We simply took that photo up to the Cast Member at the desk and they were easily able to add it to our stateroom account so it was included on our photo cd.
I suggest checking Shutters a couple times throughout your sailing to be sure your photos are all in the same album and then confirm this with the Cast Member there, and you should have no problem with receiving a complete cd. Just don't forget to pick it up the last morning before you disembark!
Have fun on your cruise, Natalie!