I understand that *G status has access to Star Alliance lounges on the same date as travel on international flights. How does this privilege extend to the *G's travel partners?

For example, if 3 passengers are traveling together on the same PNR, one of the 3 is *G, can all three access the lounge? If only two are allowed, can the third pay a fee? Are they strict at the lounges on these types of things?