Genmui the oldest son of the Tokito family||20 years old and has 4 siblings

his other siblings

Muiyen second oldest 17 (turning 18 this June) Genmui Jr middle 17 (yet don't mind the name I just don't know what to name him aswell) Muian middle middle 14 *finally Muigen 12 (another ship name yay...)

Muichiro and Genya are the parents (obviously), Yuichiro (Muichiro's Twin bro) the ghost uncle

[Update]

[you play as Muiyen, she is kind, caring, likes helping and loves kimono even she has one as a demon slayer uniform]