–-Annabeth Chase, talking about her stepmother, in The Lightning Thief
Annabeth was born on July 12, 1993.   When Annabeth was five, her father got married. He and his wife had two kids together, twins Matthew and Bobby Chase. Because Annabeth was a demigod. her family was constantly being attacked by monsters. causing constant fighting between Annabeth and her parents, as they felt that she was always putting them in danger. When she was little, she used to be attacked, bitten and covered in cobwebs by spiders at night, and she would scream for her father but her step-mom thought she was making it up and refused to call her father because whenever her step-mom came into the room, the spiders would hide away and by the time she got dressed each morning, the bites had faded. As a result, Annabeth felt that her step-mom thought that she was a freak, so she ran away from home at age seven because she believed that she was not wanted by her family members. She then fought monsters with the guidance of her mother, Athena. for a few months, using only a mortal hammer.
Meeting Thalia Grace and Luke
Eventually, they ran into Grover Underwood. a satyr. who took them to camp, but took some wrong turns on the way. One of these was into a Cyclops lair, and everyone but Annabeth was captured. Annabeth, after wandering around, found where the Cyclops was keeping Thalia, Luke and Grover. They were hanging over a pot. The Cyclops tried to lure Annabeth to him by imitating her dad's voice, but instead of going to the voice and getting captured as well, she stabbed him hard in the foot and untied Thalia, who then took care of everything else.
Thalia's Pine Tree
Hearing the Prophecy
Three years later, when Annabeth was ten years old, she heard the Great Prophecy and continued to have nightmares about it. Every time a new camper came to Camp Half-Blood, Annabeth wondered if they were "the one", because Chiron told her that she would have a part to play in the Great Prophecy. Strangely, three years later, in The Sea of Monsters . Annabeth said that she did not know the whole prophecy, but she may have lied to Percy to protect him after being told to do so by Chiron.