During the 1st war where Konohagakure was having a scuffle with Kumogakure there was a sitation where the Kinkaku Attack squads were looking for those realted to the great Hashirama Senju himself in order to assimalte the Wood Release and all its secrets to thier village. This led to the attack on the Tobirama and his team which resulted in him being a casulity of war. When they found out that he was related to Hashirama they were thirlled but once they discovered he did not possess the vaunted Wood release they imeidaelty began to carry out thier search back in the hidden leaf, with one goal to find a kin to Hashirama and capture them . This led to Toshirama's parent to begin to go under a sort of a protection program in which to protect them selves and the village from ths is unprecedted