User blog comment:Miskos3/Fairy Tail Chapter 490: Fairy Tail Zerø, Review/@comment-61.18.34.115-20160620114131/@comment-26167397-20160620164955

It might refer to Zera and Gajeel you guys with it being just an expression of her being the mother since she's the origin of fairies and Gajeel the child since he is a member of the guild