What if Harry had a twin sister? Harry found out that he had twin sister, her name is Samantha 'Sam' Potter. Samantha is in Slytherin House. Harry don't believe what Professor Dumbledore told him about her. Professor Dumbledore told Harry that Harry's parents had twins Harry and Samantha but they got separated so Harry with his aunt and uncle while Samantha with The Malfoy for their safely. Professor Dumbledore told Samantha the truth about her real family. I do not own Harry Potter xx ~ Completed 19th June 2018