The rule says:
Question:
How many guests per recruit are allowed to attend Pass-In-Review?A.
Answer:
Four seats are guaranteed per recruit; however, children 12 years old and younger do not count against the four-guest maximum. The graduating recruit is responsible for identifying those individuals to be placed on the access list. Please coordinate with your recruit via letters regarding who will be on the access list. No additions, deletions or changes will be made to the access list the week of graduation. The four guests on the access list will be admitted into the ceremonial drill hall first.
Additional guests not on the access list will have to wait inside the Visitor Center until after the start of the ceremony at which time they will be allowed into the ceremonial hall if additional seating is available as space permits. No additional seating can be guaranteed. PLEASE DO NOT CALL FOR ADDITIONAL SEATS. All visitors must have valid photo identification. This requirement includes children (school ID, Social Security card or copy of birth certificate). Please be aware that security may deny base admission to guests NOT on the access list if they are not accompanied by a guest who is on the access list.
From:
http://www.bootcamp.navy.mil/faq_family.asp