You were 6 years old and been feeling really sick and been trying to take care of yourself. You wanted to tell your father but he'd just decline you and just say that you were faking it just for attention. But then it came to the day where you just couldn't take it anymore and walked behind Muzan, your father, and gently tugged on his shirt. But the he just simply ignored you but when he spoke his voice was icey cold.

"I don't care if you don't feel good. Deal with it, and suck it up."

He was always like this when you were at your lowest. He never really wanted to have any kids in the first place and that's what hurt the most. He didn't love you or care for you. He thought you were nothing but useless to him and a disgrace of a child that shared the same bloodline as him.