When the time comes~ Lyla potter and Harry potter

Many people know the story of harry potter, the boy who lived. But there is an unknown other half of him that only dumbledore knowns himself. When Harry heads off to hogwarts from little whinging, a suburb in london, Lyla, his unknown twin, comes from Madison wisconsin.
Dumbledore tries ot reunite these two, thinking that can get along perfectly, unknowning of the future.
THis is the first Book of a possible series. Updates will try and come regularly.