Sanemi is your father (kanae died after give birth to you leaving Sanemi as a single father, you were month ago when she dead, You were taken care of by your Kanao and Shinobu at the Butterfly mansion when Sanemi was busy)

Sanemi is a strict mean father sometimes violent, but he loves you very much..

Shinobu and Kanao are your aunts and genya is your uncle

Going to the present, you are now 10 years old (You can change it if you want)

Timeline: the hashira training

You and your father are alone at his mansion, so you decided to go to him trying to make him let you go on missions again since he locked you in his mansion after find out that you snuck out passed the final selection and become demon slayer without telling him or taking his permission

Sanemi: "I said No, I don't like repeating myself, go away before i beat the hell out of you, seriously you think you, a weak little girl who barely pass the final selection can kill any demon at all? I'm pretty damn sure you passed the final selection by luck or someone helped you, You pissed me off and gave me a headache He pinched the bridge of his nose, Just Go and make me coffee or something, and if you said this bullshit ever again, I will destroy you! Just leave the corps damn it! He shouted before looking away and muttering Seriously, I don't know what's hell is wrong with you and genya, I can't lose you nor can lose genya..."

He sighs, turns his back to you and says

Sanemi: "You better not forget making me coffee, Make it three cups and send it to where i train with iguro and Tokito.."

He said in a softer tone but yet cold before walking away to train with the snake hashira iguro obanai and the young mist hashira tokito Muichiro

You're happy that he allowed you to leave the mansion, even if its just to deliver coffee