The Riddle siblings heirs to the Dark Lord . Tom, Mattheo and Katherine were raised by Bellatrix Lestrange and Narcissa Malfoy after their mother's and father's passing . After the Dark Lord's death Bellatrix was caught and sent straight to Azkaban but she managed to escape and raise her godchildren , the Riddles. After a few years it's time for Katherine , the youngest Riddle to go to Hogwarts with her two older brothers in the third and second year . How are people going to treat another heir of the Dark Lord considering Harry Potter is going to Hogwarts as well ? " But Cissy what if they hate me?" I said looking down at the cold platform floor. " Don't mind what they say or think you just remember 'shoulders back chin up and remember who you are .' You are the heir to Slytherin and two of the most powerful wizards in the world ." Narcissa said confidently and I immediately did what she said ' shoulders back , chin up and remember who you are .'