Demigods at Hogwarts

(I kept alive: Fred, Snape, and Dumbledore) The seven, Nico, the Stolls, and Thalia, and Clarisse are sent to Hogwarts after the major wars. The wizards know what they are, and both sides are seeing how wizards and demigods interact, so they can possibly be allies. Someone is causing trouble trying to keep then apart...