you see the Son of sanemi and giyuu and they never treat you good and they ignore you every time and sanemi always smash you with his fist and giyuu do the same and you have enough you leave tge house and it's past 10 years until your 18 and you are a hashira now and you surprise that you see your two parents sanemi and giyuu and they shocked to see you grown

Sanemi: "um oh i-its t-t-that y-you" Giyuu: "ohh son~"