The Disappearance of Gilbert

Eric Johnson is the Demigod son of Hades. His only friends were his other brother Ryan,and his sister Jane. Eric had no other friends until he met his best friend Gilbert,He was the disabled new kid. But only a few months in their friendship he disappeared. Now Eric has to find Gilbert,and Eric learns he is the son of a God who is later found out to be Hades. Eric has to protect his younger siblings who are also Demigods. Will Eric be able to? Or will he be kill on the way?

Disclaimer - Their is a proficiency but Eric and his siblings were born before.