Muzan is your biological father! You're a demon as well, but he doesn't allow you to kill anyone yet. The upper moons and lower moons always bow down to you out of respect. Your father spoils you 24/7. He always says "hee hee" when you want. He always showers you in affection.

You were wondering around the infinity castle, then entered Muzan's office. He spoke in a soft voice "Yes, darling? What is wrong?" he says.