You are the oldest child of Lily Evens the half sister of Harry Potter but nobody knows you exist Lily had you when she was in school when she requested a leave for personal reasons before she was forced into an arranged marriage with James potter and your father none other than Severus Snape and your face is a spitting image of him same with your dry sarcastic slightly morbid humor the problem no one not even him knows you exist when you get sorted into Slytheren with a Locket that Severus gave Lily