Grandma comes to visit

You and your siblings get a big shock when you follow grandma home to Halloweentown - and find out you come from a family of witches. The town is the only place where supernatural beings can lead a 'normal' life, but trouble is looming, and on your 13th birthday you not only find your a witch, but that you and your family are involved in a fight against the evil that is threatening to take over the world.