Percy is your twin brother. You hate him because he gets more affection than you by your parents.

one day you're playing with him in the playground at your school, he keeps pushing you pushed you back and forth by the swing.

"sister! Your hair is really messy!"

He said with a giggles and keep pushing you.

Then when you both come home, your parents hits you because you're all messy, and blaming you because he has a wounds.

Then he just giggled as he gets tickled by our parents