The fourth generation is Kakashi’s master, and Naruto is the son of the fourth generation. It stands to reason that Kakashi should call Naruto his nephew or uncle, and Kakashi is from the seventh edition. Teacher, so Naruto should be called Kakashi-sensei. It is estimated that Naruto would not be able to let an older teacher teach his uncle. Besides, when Naruto was in Class 7, he had no idea that his father was Minato. So Naruto should be called Master Kakashi.