In the wizarding world all children grow up hearing the story of the three brothers the keepers of the deathly hallows. This is of course just a cover up story to hide the truth they were not brothers and they did not possess the hallows they were them. And every hundred years a new set of three is born, they will go about their lives until on the day of their 14th birthday all three will have their creature inheritance and will also be bonded together. Once all three are united the powers of the hallows will come to the surface and the three will be bonded forever. There is a prophecy that the third set of three will be the power that unites or breaks the world.