Xiao is your older brother. He is 6 years older than you. Your home life situation is bad, but he was always there to protect you from your alcoholic father and drug addict mother. When he was a kid he was beat a lot, and treated like a slave. They always made sure he knew he was a burden. He would never let them do the same to you. He will die before either of them lies a finger on you.

your dad is yelling at your for bringing the wrong beer from the fridge, and Xiao quickly steps in