Well Hashirama had a loving wife Mito and i was thinking why would hashirama not have a son to pass his will of fire and his teachings on to him ? And then i was thinking why Madara had a thing for the young uzumaki Nagato....is it possible that nagato was somehow adópted because of the war or maybe something bad happen ? Could it be possible that the real parents of Nagato are Hashirama and Mito ?