You shouldn't let your friends harass your little siblings.
Jeff's little brother is getting talked down to by Jeff's friends as Jeff is walking in.
Jeff wants to make a comment about the situation.
Jeff adamantly tells his friends to stop treating his little brother like this and takes control of the situation.
Jeff joins his friends in talking down to his little brother.
Jeff's friends respect his decision and the little brother starts admiring Jeff more.
Jeff's little brother eventually grows up to despise Jeff and his friends.