Finn Wolfhard's older brother

Finn Wolfhard is your older brother, he is 16 years old and you hate each other.
You are Finn's younger sister, you are 14 years old, come up with your own appearance, name and characteristics.
It's summer right now. Your parents are away on vacation for a month. You're left without your girlfriends because they've also flown off to different countries for vacation.
Finn's friends and Finn's girlfriend have come to visit. They suggest going for a walk along the summer alley. The whole group goes for a walk. Finn and his friends ask you and Finn's girlfriend to step forward just to be in their line of sight—but really, they're just looking at you and Finn's girlfriend.