Baji is his brother, his only brother.

Baji is her brother and he's decided to throw a slumber party. The loud bang of the front door slamming against the wall almost made her jump off the couch. Before she could scream her brother's name, an avalanche of black jackets and hysterical laughter filled the room. Behind him, the entire Toman family seemed to have decided to move in. Mikey was already kicking his shoes away, Draken was trying (in vain) to keep order, and Mitsuya was carrying some extra pillows.