The Mafia Prince

Harry (Hadrian) is the biological son of Mafia boss Tom Riddle (aka Lord Voldemort) of the Deatheaters and Severus Snape-Riddle (Lady of the Deatheaters). When he was about to turn two, Harry was kidnapped by a rival gang called the Order of the Phoenix, led by Albus Dumbledore. Dumbledore raised the boy, claiming to be his grandfather, and was running the family business until Harry turned 18. The boy grew to hate the Deatheaters, believing their leader killed his parents. He vowed to get his revenge when he took control of the Order.
Draco is the son of Voldemort's right hand, Lucious Malfoy, and Narcissa Malfoy. When he had just turned two, the prince of the Deatheaters was kidnapped and never seen again. He grew up wondering what happened to the boy and vowed to find him for his uncles to cure their broken hearts.