User blog comment:B214/High School DxD EX/@comment-104.178.60.59-20160120185935/@comment-79.37.242.251-20160124003452

Well Kurenai is the eldest brother so obviously he is respected by other siblings and he did show great intelligence and coldness in battle.

Airi, currently, is the strongest and she is the second in command.

Ex is the second strongest of Ise's children but his recklessness and age don't make him adapt to be the leader or the second in command.