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Naruto has a brother or a sister? He does not have any siblings. Naruto is already a child. Our knowledge of Naruto’s family is limited to his mother and father. Kushina Uzumaki, his mother, and his father, Minato Namikaze. Jiraiya is also a member of the family. He is considered the godfather of Naruto since he named him after a character in one of his less well known books. Apart from that, that is Naruto’s family, he does not have a brother or sister.
It has never been stated in the manga and anime that his father Minato Namikaze, aka the 4th Hokage, or his mother Kushina Uzumaki had any other children besides Naruto. I am not convinced Minato would risk his life to seal the 9 tailed fox into Naruto if he had other children, but that’s just my opinion.
Naruto’s parents were allegedly killed by a nine-tailed fox or something, so he was an only child. HOWEVER. It is rumored that his father was the fourth hokage. Additionally, I’ve heard that his father could’ve also been a leader (leader of the Akatsuki) but that’s just rumor, I’m not sure if it’s true. The manga never mentions any siblings, so everyone assumes that Naruto is a single child. To my knowledge, Naruto does not have siblings!
I don’t think so, unless Minato, the Fourth (and his father), have been really bad kids… Nope. Not to my knowledge. He’s the only child in the family but not the only one. His parents died during the war against the kyubi (his dad was the 4th hokage, and his mother probably perished in one of the battles against the kyubi) before they could have had any more children. The announcement hasn’t been made…but who knows?