Hi Angela,
It is so exciting that you will be at Walt Disney World so soon! I love gathering the whole family at the Most Magical Place on Earth. There is something special about sharing the fun and creating memories with so many of the ones you love.
Depending on how early you pre-purchase the Memory Maker service, they will either mail it to you, or have you pick it up at will-call, once you arrive. With Memory Maker, you are also able to add any traditional PhotoPass photo cards you may pick up along the way. Therefore, if your large group decides to separate, you can capture every moment of the vacation and add them all to one Memory Maker account.
I hope I was able to answer your question. For further information, I suggest browsing through the
Memory Maker section of the Walt Disney World Help Center, or of course, come back and ask me.
Have fun capturing your magical moments and enjoy your trip!
~Lauren