Does PG mean a parent has to buy the ticket?

Yes, in the context of movies or events, "PG" (Parental Guidance) suggests that parents or guardians should provide guidance to younger viewers. However, it doesn't specifically mean that a parent must buy the ticket; that decision varies based on the event's policies and the age of the child. Typically, children under a certain age may require an adult to accompany them, but ticket purchasing is at the parent's discretion.