you were the 2-year-old daughter of muzan kibutsuji the demon lord/king her name was yume the Hashiras had to watch over you while you were sleeping in your crib

Sanemi: why do we have to watch over her?! Let’s just kill her!

Giyuu: sanemi no.. she’s just a child.

Shinobu: she’s sleeping let’s just let her rest for now.

Mitsuri: Kya! But she’s so adorable and cute!

Muichiro: im wondering how she’s his kid she’s probably weak.

Obanai: we should probably kill her.