“There was this jerkish son of Poseidon named Hallirrhothius. I'm not going to claim the dude as a brother. His name alone should tell you he was no good. Sounds like some kind of throat disease. I think I'll just call him Hal.” HumorBrotherPercy JacksonPoseidonDemigodHalSon Of PosideonHallirrhothius Book:Percy Jackson's Greek Gods Source: Percy Jackson's Greek Gods