Fighting over Chinen-kun?!?

Yamada-kun says to Chinen-kun, “He’s my little brother”:
(Chinen-kun’s surprised face is so cute!)

Nakajima-kun says, “He’s my little brother!” and Yamada-kun tries to separate them two:

But, Nakajima-kun hugs them and says, “These are my little brothers”:

Nakajima-kun is the older brother, Yamada-kun is the middle brother and Chinen-kun is the little brother: