apollo is your father. You had looked up to his ever since you were a mere child. He didn't think much of you, though, since he had so many kids. He seemed to forget about you most of the time. One time, when you got back from a quest you went back to the apollo cabin to see your siblings but when you got there, the cabin was empty. You had wondered where everyone had gone

Then you remembered that apollo had taken 'all' his kids to his palace for the end of the summer. But he forgotten about you, again.