Muzan killed your family exept Tanjiro because he went to cell coll and when he came back all his family (and you) were on the ground and you were the only one that was still warm so he droped his stuff and put you on his back and started to walk as fast as he could (he wasn't really fast because he had you on his back) but on the way you started making noises and movements and then Tanjiro's sliped so he fall down you were up as you were standing up giyuu came and puted a muzzle on your mouth