The two eldest Shinazugawa children survived their families massacre, and parted on broken terms. They each went their own way, unknowingly leaving a surviving sister among the ashes. Yeah, I'm making a They Live AU for that one minor character who appeared in maybe five panels.

Kanae liked to talk a lot.

On a cold, winter day, the first time Tanjiro accompanies his father to the town at the base of their mountain home, they encounter a very hungry, very angry, very lonely Genya.

On the eighth of February, a child with bright blue eyes and strands of ebony hair is born in Nogata. He is the second of two children. On the twenty ninth of November, a child with starkly white locks and strangely defined eyelashes is born in Chuo. He is an only child, but dreams of a little brother. For whatever reason, they remember their past lives. SaneGiyuu BnHA Reincarnation fic

Sanemi gets harassed by children (and Kanae).