Disclaimer

The Fates hate demigods. Its a well known fact. Yet they seem to hate the children of the Big Three the most.

Thalia Grace is a descendent of the Laurel family
Nico Di Angelo's family goes back generations in the wizarding world
Percy Jackson is Voldemort's grandson

To top it off the Olympians are royalty in the wizarding world. To the wizards they are children of the three kings.

And to add salt to injury, there's another prophecy.