Hi, Vanessa! Thanks for allowing us to help you with your upcoming Walt Disney World vacation.
If your son has a MagicBand that he has used before, then he can use that MagicBand again. Currently, MagicBands can't be reassigned to guests once they have been linked to a guest.
So if you want him to use one of your MagicBands, he won't be able to, unfortunately. If he doesn't have an old MagicBand that's just fine as he will receive an Admission Card with his school that is used just like a MagicBand. You can also purchase a MagicBand for him from the
ShopDisney website or mobile app. If your son is linked to your husband and daughter in the My Disney Experience account (Family and Friends), all of the PhotoPass pictures will appear in their My Disney Experience account, giving everyone access to all of those magical photos!
So whether or not your son is hanging out at Disney with your husband and daughter, he'll be able to just tap his MagicBand or Admission Card with the Photpass Photographer and those pictures will magically appear on your account. Just be sure that everyone is linked in the My Disney Experience account. If you find that you are having trouble linking your My Disney Experience accounts, just call 407-939-4357 and have a Cast Member assist you with this.
Here's to hoping your family has a magical time at Walt Disney World! Stop by and see us again if you have more questions!
Korliss