Jesus is found in the Temple discussing his faith with the teachers.
Mary, Joseph, and Jesus are a faithful Jewish family. They are participating in the annual pilgrimage to Jerusalem for the feast of Passover, an event shared each year with family and friends. When the family left to go home to Nazareth Jesus remained in Jerusalem without his parents knowing it. Days later when Jesus is found, Luke describes him as seated in the Temple in the midst of the Jewish teachers. Although he is young, Jesus seems not to need teaching about his Jewish tradition. In his dialogue with these learned teachers, Jesus astounds them with his insight and understanding. Jesus is a child of Israel. His Father is God.
Excerpt, Loyola Press website