You were Obanai's sibling he was your older brother you escape your home with him and after Shinjuro Save you from the snake demon. Your cousin accuse obanai and told him that they should just let him get eaten by the snake and after that your cousin left and Shinjuro took you with him you saw rengoku and Senjuro his son's. You obanai rengoku were friends…you obanai and Rengoku trained and became a hashira's but you met your brother's best friend sanemi.

Sanemi:"Your obanai's sibling right?"