yes, i believe he know.
Yes, he is.
Minato was Kakashi's sensei, and they look a lot alike. He probably always knew.
If you're refering to Yondaime Hokage, his son would be Uzumaki Naruto.
Kakashi was more like a mentor to Naruto. They were very close, but it was probably Jiraiya that thought of Naruto in more of a father and son type way.
no.he did sealing the niine tailed fox into his son,naruto
Kakashi learns that Naruto is the son of Minato Namikaze, the Fourth Hokage, in Episode 168 of "Naruto Shippuden," titled "The Fourth Hokage." During a conversation with Naruto, Kakashi reveals that he knew Naruto's father and shares his connection to Minato, highlighting the legacy that Naruto carries. This moment is significant as it deepens Naruto's character development and his relationship with his heritage.
No. Naruto is the fourth hokage's so. kakashi is just his student.
Naruto Shippuden episode 199
The 3rd Hokage, Jiraya, Tsunade and Kakashi knows that naruto is fourth hokage's son.
Lady tsunade could possibly be yondaime's mother if you look at a picture of her younger brother and yondaime and naruto they all look identical. It is also wierd to here naruto call her granny it seems that ppl think that it is only to annoy her but what if it was all meant to be her brother looks like naruto and yondaime and also right before jiraiya left to fight pain he had a talk with tsunade about yondaime and she was about to cry and right there jiraiya said if he was my sons i wouldve been proud of him meaning that it could be her son and naruto could be her grandson. the manga in which they talk i think is manga chapter 367 or 361 if its not im sorry but it's right before jiraiya is about to leave to the rain village.
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.
In the Naruto Shonen Jump episodes, no they don't. And, in most of the Shippuden episodes they don't know. Actually, until Naruto battles Pein and he transforms into the Nine Tails, Naruto doesn't even know himself. Besides that, the hokage, Kakashi, yamato and most of the other shinobi know. it think his friends find out after he battles Pein. it depends on wether you're talking about the Manga or Anime.