There are free tickets for kids at Red Rooster (maximum 2 per adult) which you can purchase here.
We do a very cheap teen ticket also, for those between the ages of 13 and 18. Kids receive a paper wristband on entry and you should write an adult's phone number on the wristband should we need to contact you.
There is also a dedicated family camping area for which you can purchase a pass via the above link (Please Note - Only 1 Ticket needed per family to access the area. Only available to those with Kids Tickets).