Yes, you can take your husband off the reservation and add someone different. I just did that with a room only reservation this summer. Now, if you book a package, you can make changes to the reservation up to 45 days before check-in without incurring change fees. If you make changes after that, they might charge you a fee. I just booked a package with a check-in date of Dec. 12th and I have until Oct. 28th to make any changes without being charged a fee. I told the CM that I might possibly add my DD16 to the reservation and she said if I did it after Oct. 28th, they could charge a fee, but they might waive it since I'm actually adding another person to the reservation.