Yes, he been knowing since Itachi even came, because he remembered what Sasuke said in the third episode and third chapter in the original Naruto manga. Sasuke said he's wanting to kill a "certain someone", which was Itachi Uchiha.
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Both Kakashi and Itachi know that Naruto is the son of the 4th. watch episode 82 and you'll see.
Spoiler Alert
Itachi says their after the 4th's legacy as in his son and when Itachi says that Kakashi thinks "Naruto he's after Naruto."
Does it matter? As far as I know he couldn't care less about sakura or Akatsuki.
I also do not believe Madara cares about Akatsuki and didn't tell him.
Yes they are brothers. but sasuke wants to kill him because itachi murdered thier clan.
Naruto Shippuden episode 199
What episode of Naruto was the fourth hokage in?SPOILERS BEWARE*****************************************************************Their are 2 episodes the Fourth Hokage appears. In the prolouge and in the most recent (July,22,2010) episode, where he talks with Naruto and convinces him no to rip the Nine Tail Seal.
Itachi Uchiha knew the true identities of Naruto's parents because he was a member of the Uchiha clan and had access to the clan's historical records. Itachi was a highly skilled and knowledgeable ninja who was privy to confidential information within the village. Additionally, Itachi had a personal connection to Naruto's parents through his friendship with Naruto's father, Minato Namikaze, who was the Fourth Hokage of the Hidden Leaf Village.
no one really knows what episode obito dies in all we know is when he dies he stabs his own eye when it has sharningan and slashes kakashis eye with that kunie giving kakashi sharningan actually he died when he was saving kakashi from the rock slide in chapter 243 Actually, There is an episode in the anime. It's Naruto Shippuudent episode 119 & 120. It's a flashback episode for Kakashi. *Spoiler Alert!* It also shows Naruto's Father, Yellowflash or fourth Hokage, And his teammates. It's how he came to care for his teammates and how he got the shirigan(SP?)
Kakashi reveals that the Rasengan is an incomplete jutsu as he is not able to combine his own elemental chakra affinity into it, just as it's creator, the Fourth Hokage couldn't do. He then presumes that Naruto might be the first one to be able to do so. Kakashi reminds Narutothat creating a technique requires combining nature transformation with shape transformation. By completing hisWind Release training he has the former, and since he can already perform the Rasengan he has the latter. Naruto concludes that creating a new technique will be easy since he has already mastered both components, but Kakashi corrects him by showing that he can also use the Rasengan. Combining nature transformation with the Rasengan was too difficult for Kakashi and the Rasengan's creator, the Fourth Hokage. Kakashi is confident that Naruto will succeed where they failed. naruto shippuden #75+76