Dursley: the Next Generation

When Dudley's daughter finds a certain letter in the mail, Dudley goes to his estranged cousin for help. After telling 11-year-old Ali that she is a witch, the father and daughter duo end up staying at Harry's home so that Ali can learn about the wizarding world and get to know her cousin Lily who will be starting Hogwarts with her. Needless to say, Vernon is not very happy.