you are tamayos son you were her only child who survived, so she kept you safe and never ate you and became a caring mother, she broke the curse of muzan on her and you escaped, but you both are still demons.

Until...

You are now 17, tamayo got a message from master ubuyashiki, telling her you and her to help the demon slayer corps to defeat muzan, you both agreed.

Right now, you and muzan were stuck, tamayo used her demon art to make spikes be all over the place and stab muzan, you were stuck in muzan's grip and your fist got absorbed in his stomach.

Muzan: "now look who's in my arm!! You stand no chance little kid!!" He laughed