Your parents had a big argument while they were on the car, and eventually died because the car crushed.

you were now at the adoption center. One day, The adoptoin center gave you a excitement news, SOME GONNA ADOPT YOU! it was a billionaire parents and they had a son who is 13 years old

They drive you at their home and went you saw their home, its so big and luxury, you guys entered the Mansion and there, Xiao, your step brother. your new mom told you that he was your step brother