Hi Kimberly, welcome to the Disney Parks Mom's Panel!
To include the attractions digital photographs on the
PhotoPass+ account it is required to show your PhotoPass+ Card at the ride photo center. Disney Cast Members will then use the photo number shown on the rides TV screens and the PhotoPass+ Card to link the photos to your account.
So all 3 families can take as many rides photos as you can and by saving the photos number shown on the rides TV screens, each family can later revisit the rides photo center and link all the photos to the PhotoPass+ Card.
This may take some extra time and energy, but this is the only way to include all the attractions photos on the PhotoPass+ account.
Glad to help you plan a magical Disney vacation.
Hope to hear again from you.
Miguel