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Generally, no. In the majority of states, there is no obligation for a person to report a crime, unless you are a mandatory reporter. Teachers,principals, psychologists, murses, therapists, and doctors, for example are required to report abuse when they come across signs of it in their students or patients. But if you are talking about a regular citizen who was told about this type of an incident, he or she would typically not have to report the offense in most states. Indiana, however, is a state that does require of all citizens that they report their suspicion of child abuse or neglect to the authorities.
Is the alleged victim still a minor? Is she still living in the household where the abuse occurred and did the parents know of the abuse at the time?
Theoretically yes. The parents also are responsible for the safety of the minor and making sure she is kept out of harm's way and if they suspect this really occurred should report.