It establishes a relationship myth (story) to the psychological need of the three most life passage ceremonies there are: birth, initiation to adulthood and dead. Which explains why Harry Potter is as popular. It is a hero that goes through all them (the last implies Voldemorth and his own death so he can be reborn into a normal human being again) thanks to parental love. This reality is taken into account in videogame design and other stories to get our empathy.