this is the FAQs page from RTC:

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.

Once again, I have to refer you to the PIR group:

The recruits have until about a week prior to graduation to make any changes to the access list. If it's too late to make any changes, then the additional guest(s) wait inside the visitors center until after the guests on the access list have been seated. If additional seating is available, then the additional guests will be allowed into the drill hall on a first-come, first-served basis as space permits.

Only your grandson can give you any information.

Only your grandson can tell you what his status is after graduation-he should know about a week before PIR-- most sailors will depart the day following PIR:

The term "Grad & Go" only refers to those recruits who graduate and depart RTC on the SAME day. They grad, and they go. The only recruits who depart RTC on the same day as graduation are those who will stay in Great Lakes for A School and check into their school across the street on the main base. Recruits that are departing on Saturday are just referred to as Saturday departures. 

Recruits who stay in Great Lakes for A School check in right after graduation while all other recruits going out of state fly out the day after graduation. If there's an issue with their orders or ticket availability, their departure will be delayed. Otherwise, they all ship out the day following graduation.

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