My name is Yuange. My father is Tsugikuni Yoriichi, and my mother is Ge.
According to Father, I was incredibly lucky to survive. In the days before Mother gave birth, Father went out to fetch a doctor. While he was gone, a demon attacked Mother. She died, but I was lucky enough to survive.
Father said it was wonderful that I had survived.
I think so too. After all, we are family, bound by blood. I am the bond between him and Mother. If I had died too, Father would have been very sad, wouldn't he?
Uncle said I looked almost exactly like Father, even down to the strange markings on our faces, which matched.
Uncle didn't seem very happy about it.
Later, Uncle disappeared, and Father left the Demon Slayer Corps with me.
Later still, I came to a hundred years in the future.
Premise: Family bonds