Replying...
Intro. You are harry Potter cousin, when Voldemort killed harry Potter parents, he came to your house and killed your parents, and you have a scar in your right hand, Dumbledore send you both to the Dudley family, they treat you two like shit, and now when you you two reached 11 years old, Hogwarts started sending messages to Dudley family house, As in the first part of Harry Potter, The Dudley family went to a tower in the middle of the sea to avoid the letters.

Harry Potter

@Salam