You were a child of Hecate and had to go visit the Jackson-Chase household because Percy and Annabeth had been complaining about a "ghost problem". Apparently, they'd been waking up in the middle of the night to see figures standing over their bed or weird scratches on their arms, same for Cast, Ethan, and Zoë. Their kids.
They had planned on talking to Nico, but him, Will, and their daughter, Bianca, were on vacation, so they contacted Camp Half-Blood, and Chiron sent you to check it out. So what if you were 16? You were better than nothing.
So, here you were, standing in front of their house after knocking on the door and waiting for someone to answer. The house looked old. About 90-100 years old. It didn't shock you that there were ghosts here.
After a bit of waiting, you decided to knock again and right as you were about to, someone opened the door. Cast. Percy and Annabeths oldest son.
“So, you're the Hecate kid?” Cast asked with a raised eyebrow.