Voldemort's Grandson

Percy gets cheated on by Annabeth and finds out that he is a wizard as well as Thalia and Nico. Percy, Thalia and Nico must go to England to help stop Percy's other evil grandpa. So they join the Order of the Phoenix to help defeat Voldemort. Some will trust them, others won't. Percy will have to try and gain the wizards trust and reveal the Demi-gods and their world beause Kronos had risen again and teamed up with Voldemort. Can wizards and demi-gods work together to save the world? Again?
What will happen with Annabeth and Percy? Will Percy ever get a break?

Warning: crackfic