Tsugikuni brothers

Yoriichi Tsugikuni and Michikatsu Tsugikuni are twin brothers and they were really close as family before Michikatsu became a demon as kids Michikatsu was always getting abusived by their parents and Yoriichi always gets everything but Yoriichi didn't want all of it since they both lost their loved ones and Yoriichi was born with the demon slayer mark on his forehead and Michikatsu always gave him a chance to for fill his dream as a demon slayer and it came true they're both hashiras but instead of Michikatsu becoming a demon with his moon breathing Michikatsu disagrees to Muzan's offer and lived on as a hashira with Yoriichi