Board Thread:Theories and Speculation/@comment-31099706-20171112093850/@comment-30323490-20171112152308

I believe that only Naruto, Sasuke, Hagoromo, Kaguya, BZ, Obito and the first 4 Hokage (after being told by Hagoromo) ever knew about the whole reincarnation thing. I don't think Madara did, since he was wondering if himself and Sasuke are related other than blood-wise.

I think Obito knew because of the conversation he had with Naruto, Kakashi and Yamato, when he told them about Itachi's past. I think he also talked about Madara/Hashirama and Naruto/Sasuke and their reincarnation link, but i might be wrong.

Anyway, right now the only persons alive who know about the whole reincarnation deal are Naruto and Sasuke themselves.