Harry Potter and The Long Lost Family

Voldemort's attack on the Potter Family failed horribly when his killing curse was reflected towards him by Harry Potter. Due to this, no one died that night. But William, Harry's brother took the credit for it. While he is living happily with a loving family. Harry is cast of to the Dursleys. How does this affect the relationship between the Harry and the rest of his Family. WBWL