Sasuke Uchiha is the second son of Fugaku Uchiha and Mikoto Uchiha and is the younger brother of Itachi Uchiha. During the Nine-Tails Invasion, Sasuke was still a toddler and had no idea what was going on. When he was four, he overheard about the tensions between Konoha and the Uchiha Clan. A coup d'etat was successfully prevented with a treaty between the Uchiha and the rest of Konoha but at the cost of Shisui Uchiha's life. From then on, things had settled.