Princess policy states that children must be potty trained to participate in the kids activities. Princess counselors will not change diapers.
Parents are not allowed in the kids center. Only to pick-up and drop-off the kids. Parents constantly checking in on their kids disrupts the flow of activities in the kids center.
If you kids have an "accident" while in the activities, unless they can tell the counselors what happened, you will have stinky kids and will be asked to leave the program, all of this is on the assumption that they let your twins in in the first place. They are fairly strict.