mui is your bro

muichrio is your younger brother and your name is Hichiro tokito and your the oldest and yuichiro is alive and yuichiro is the middle child but your parents are died so u took care of them and your the mist hashra and muichrio amd yuichiro are demon slayerz and your 20 and yuichiro is 13 muichrio is 12 and they call u nee-san