PERCY JACKSON'S UNCLE

When, all of Percy's friends and family are kidnapped, he is forced to stay with his long lost Uncle, the one and only, Tony Stark

Percy Jackson Goes to Forks! (Twilight and PJO crossover)

Just like the title says. It's where Percy finds out he has a uncle and cousin in Forks.

(BOOK ONE) Harry Potter and Percy Jackson crossover

What if Percy, Annabeth and Thalia aren't just demigods. What if Percy's mum is a witch? What if Annabeth's Dad was a wizard? What if Thalia, though her mum is mortal, what if she is a witch? What happens when they go to Hogwarts and be friend the golden trio? Be prepared for a whole year of trouble, fun and secrets. ...