User blog comment:Sithlord Andeddu/Irene's scheme/@comment-88.145.191.141-20160810195135/@comment-7418318-20160810201938

Wouldn't it be more interesting if Irene turned out to be the younger sister. With her ability to change people, she might well have changed her body to appear older to have an easier time commanding respect and authority (along with the timeskip making her physically the older sister, even if Erza is the chonological older one).

That way Irene could be caught between being happy that her supposedly dead sister is alive and not so happy about the same sister being the one who would inherit something or the other that their parents owned.

At the moment the greed won out over the sisterly love.