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Sasuke's early childhood, as told over the course of Naruto manga volume twenty-five, was spent living in the shadow of his older brother, Itachi Uchiha. As a natural prodigy of the Uchiha clan, Itachi was the pride of their family. In an effort to win some recognition for himself, Sasuke trained diligently to win some of his parents' attention, though he was never able to surpass the milestones set in place by his brother.As the years went by only Itachi would acknowledge Sasuke's accomplishments and treat him as part of the family, filling the role of a loving older brother.[17] In time, Itachi began to distance himself from the clan and fell out of his family's confidence. Because of this, the Uchiha began to look to Sasuke as the new future for the clan, and he finally began to receive the attention he had craved.

Soon after Sasuke started to be accepted into his family, he returned home one day find the streets littered with the corpses of the Uchiha clan. Upon rushing home to alert his parents to the tragedy, Sasuke found Itachi standing over their bodies. His responsibility for the murders clear, Itachi explained that he had killed their family only to test his abilities. As Sasuke tried to flee, Itachi went on to explain that he had never loved his little brother. Claiming that Sasuke was not worth killing, Itachi encouraged him to get stronger by living a life of hate and anger towards him, with his sole purpose being to avenge the clan. Itachi left, and in the absence of a loving family Sasuke agreed to do as instructed, dedicating his life to killing Itachi.Years later, in Part II of the series, Sasuke is shown to have some doubts out about the events of that night. It is not until after Itachi's death that he learns the truth surrounding the massacre of the Uchiha: that it was all done for Sasuke's good.