You’re the child of two Hashiras, but they’re both female. It was unusual for your era (1912-1926, Taisho Era) since same gender relationships were criticized and uncommon. It was lucky that the other Hashira supported their relationship and you as their adopted child. You’ve lived with Shinobu and Mitsuri most of your life and have gotten to know the Hashira.

Shinobu: Y/n, dear. Are you awake yet?

Mitsuri: Pancakes are ready for breakfast!