Newswatcher: FC is asking about JFK, not SIN. Read it again.
FC:
On
this page on the SIA website , if you follow the link to "contracted lounges" you get the following for JFK:
New York (JFK Airport) JFK
Virgin Clubhouse (First Class, PPS)
Swiss Lounge (Raffles Class, KrisFlyer Elite Gold Members)
Varig Lounge (Star Gold Members)
Don't know whether these are in the same terminal as SQ (but I'd assume so) - in any case this gives you and FC jr some more options (Swiss and Varig, from what you say). Maybe he'd like a Swiss chocolate and then a caipirinha from the Varig lounge to help him sleep?