Tengen Uzui - 'No'

That word hurt like a train. Your big brother, Tengen Uzui, told you, 'you can't join the demon slayer corps.' he had lost all his siblings, he can't lose you either. He and his wives cared deeply about you. And no matter what, you always kept the sword under your bed.

"And that's final. I'm a hashira, you have protection under me, Hinatsuru, Suma, and Makio's care. You are not going on a mission."