Leo heads away from camp and starts to think about his childhood.
He remembers his aunt, Tía Callida, trying to kill him over and over. No really—she put him in a fire, she tried to get him to poke a rattlesnake… but no one arrested her or intervened. (Leo wasn't hurt by the fire, by the by, because he has flame powers.)
Leo remembers drawing a flying boat when he was five. The wind blew the picture away though. Then Callida said he should make a fire, and he melted all the crayons, which freaked his mother out when she found him.
Leo figures that Tía Callida was Hera (hopefully you'd figured that out already too.)
Leo then remembers his mom, who was a mechanical engineer. She told him he'd meet his dad someday; she seems to have known that his dad was Hephaestus.
We then go to the night Leo's mom died. His mom went into the warehouse where she worked, and the doors closed and locked. A creepy old woman in clothes made of earth appeared and told Leo she was going to break his spirit.
Leo attacked her by generating flames, blacked out, and when he woke his mom was dead and the warehouse had burned down. Yikes.
Leo's back in the present, and hears Callida's voice telling him it wasn't his fault. Then he plunges into the woods promising to avenge his mom's death by face-planting the creepy evil woman. So much for breaking his spirit, creepy evil woman. Take that.