Dakkou Suru Made Ochimasen - Vol. 2 Ch. 17

[harukuro]

oh no , waifu is sad without husbando..

 

[arcoviain]

...we saw her older brother alive and reigning in the useless little brother a few chapters back.

Minor correction: the one Tomo was reigning in was both his and Yuno's older brother, the oldest sibling overall (unless there's another we haven't been introduced to yet). In terms of current ranking, Yuno is the youngest and Tomo is the middle child.