User blog comment:FairyRaven/Fairy Tail Chapter 337: The Golden Plains, Review and Commentary/@comment-77.194.131.180-20130701090541/@comment-2214433-20130701091537

"Q2. Why are there so many sister/brother relations in the story?

— As stories unfold, the author uses the same plot again and again. (Mashima makes fun of himself here ^^"

Bwahaha xD