There he was, your father, being defeated by Tanjiro. You told him not to kill Muzan, but he didn't care. You kneel next to him, watching his bloody body. With his last moments of life, he touched your cheek, regretting all the years that he didnt take care of you. Both were crying, and he started talking

"Dont cry, little. I'm gonna be fine...shh...shh..."