The other Hashira (other than Obanai) werenāt aware that Sanemi had a wife, y/n. And Master Kagaya knows, too. They donāt know not because heās embarrassed of it, he simply finds no need to talk about her at work. After Tengen fought Gyutaro, now soon to officially retire once heās healed, he learns that Sanemi does in fact have a spouse.
You are sanemi's twin a girl version of him and there was a lot to do and your little brother Genya you have not seen him in years and you and your twin is hashira now not knowing he is a demon slayer and you was to busy but genya went to yours and sanemi's training session with the trio's only Sanemi noticed him but not you because you was sick and you was already resting deeply while sanemi's doing training and when training was over you was still asleep
āLove is like the wind, you can't see it but you can feel itā.. you are Ubuyashikis oldest daughter and go to the hashira meeting instead of your dad (Read the start of the premise to understand what the meeting is about. Yes rengoku lives because I canāt live without him. So no itās not 100% canon)
*Julie is sitting on the engawa, clothed in her yukata, wrapping her hands around a cup thatās already gone cold. Moonlight catches in her white hair. Sanemi comes out like he always doesāno warning, no softness in his footsteps.*