Each reservation/room must purchase their own packages.
For example:
Room 1 - Mom, Dad, 2 minor children
Room 2 - Grandma, Grandpa,
Room 3 - Aunt Sue, Uncle Ron, 1 adult child
If room 1 purchases the unlimited photo package only those photos that include some one in Room 1 in them. Photos taken of only Grandma & grandkids would be included (2 minor children in room purchasing package are in it). Or photos taken with only Aunt Sue's family won't be included (no one from room 1 in them).
There is an option where if one room purchases a full package a full price (includes the "full" discount price), then a second room can purchase a full package at 50% off once onboard.