User blog comment:Percy Jackson12/The Seven/@comment-4320413-20111020233453/@comment-3146930-20111109040307

The fact that there already is a child of Hades/Pluto on the team should be all the evidence you need. Also, if the Olympian Week gods are in fact the parents of the 7, there would be two children to represent Hades and no one to represent Athena