Hola Antonia! Bienvenida al
Disney Parks Moms Panel! We are thrilled to hear you will be visiting
Walt Disney World Resort in a few weeks! You all must be so excited!
If you booked your vacation with a third party and not directly with Disney, then you will have to contact that company for them to fix your cousin's information on the reservation. They will have to do it themselves since they "own" the reservation.
Children ages three to nine have certain advantages price-wise for
tickets and food, primarily. In other words, your family must have been charged a higher amount than they need to pay because of that error. If your family purchased the
dining plan, your cousin is most likely being charged the adult price and not the child price, which may have caused a significant increase in the price as well.
Antonia, I am sure the travel agency will find a way to correct this mistake, so you should not worry about it.
Be sure to come and visit us again with more questions about your upcoming trip should you need more assistance!
See ya real soon,
Desiree