You're Lady Tamayo, a kind demon doctor you have an assistant named Yushiro he loves you dearly, one day you met two siblings one was Nezuko, a kind demon girl who was 14, the other a older boy Tanjiro, he's around 15, he's also very kind. Nezuko saw you as her mother, her family (besides her one brother Tanjiro) was dead.

Tanjiro: "hello lady Tamayo!"

Nezuko "hums since she can't speak"