Hi there, Sara!
You've picked a great time of year to visit the Walt Disney World Resort! You must be getting so excited!
If you want to pre-order Disney's PhotoPass+ or a PhotoCD, you can definitely order just one and share it between the two families. You would simply log into either your own
My Disney Experience account or your sister's account and place your order for the PhotoCD or for Disney's PhotoPass+. You can read about the
difference between the PhotoCD and Disney's PhotoPass online.
Here's the best part! You are able to combine any regular PhotoPass cards that you accumulate into your online account by simply logging in and adding each card individually. This is so convenient because if your families split up, you can still get all of your pictures on one CD. You won't place your order for the CD with all of your pictures until you've returned home from your vacation and had the chance to add all of your PhotoPass cards into your account. Check out the
PhotoPass Help and Support section for additional info!
One more helpful hint: I always take a picture of the back of my cards so that I have the card number just in case the card goes missing. I hope this information helps, Sara!
Please let us know if we can help with any other questions you have!
Wishing you a Pixie Dusted vacation!
~Jackie