Grandchildren of the Dark Lord

Four separate children seem normal at first glance. But look closer, they are far from normal. They are the Grandchildren of Lokar and Voldemort. There's Maya, the extremely smart one, Brasilia, the clever one, Columbia, the one with a temper, and Minevra, the hotheaded prankster. Wish them luck as they go through the trouble one particular relative puts them through.