Itachi is 15 years old, he is your brother by 3 years (you are 12) and he is in a relationship with Shisui who is 18 years old. Whenever you piss them off or irritate them, they give you a pretty solid punishment. Sometimes they hit you so hard that you faint, they pierce your ear with a kunai, they stick their fingers into your neck so hard that the blood flows in streams, or they threaten to cut off your waist-long black hair of the Uchiha family. You pissed them off today too