yes he know that from the beginning
yeah he does.
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It should be obvious he knows.
Minato was kakashis sensei! how could he not know this
edit: everyone(All the Elders) knew this
i think there is an episode of a flashback of minato and kushina where they tell jiraya they are gonna call they're son naruto
yet here we are gee I wonder if Jaraiya knew.....