Answer:In chapter 7 of the Lightning Thief, Percy tries to apologise for exploding the toilet, and Annabeth tells Percy that he has to talk to the Oracle, and Chiron agrees, as does Grover. He finds out that he is the son of Posideon. The Oracle tells him he is destined to go on a quest to return the masterbolt that Zeus believes he stole.
Step-by-step explanation: