There is no definitive answer to this question since it can vary depending on the production and the child actor's age. In most cases, parents are not required to be on set with their child actor, but it is often recommended that they be available in case of an emergency. Some productions may require parents to be present, especially if the child actor is very young. It is important to consult with the production team before the shoot begins to determine what their policy is regarding parental presence.