Board Thread:General Discussion/@comment-25926288-20161207195414/@comment-1916997-20161209023430

Hmcooper4 wrote: My guess is that we may never hear about the Dragon's daughter again. The statement that he made about losing a daughter may have simply been a statement to indicate that he was not immune to the feelings of loss and discouragement that Emma and Regina were feeling in the Mirror Realm.

Not all statements made by a character need to be a setup for another story. (although they can always be used that way, if needed.) I can see this point, but the fact that this character has been around since Season 2, and also still has unanswered questions about him, like how did he get to the LWM and how does he know all about FTL, makes him bringing up a daughter, seem very much more like setup. Combine that with the fact that Mulan (a recurring character of the same ethnicity and right age, who also hasn't had a fully shown backstory) is still very much in play, makes it seem like the setup was so they could resolve both these characters.