Did they ever do anything with this?

I haven't seen Once Upon a Time in a while and I wanna know about Maleficent's daughter Lilly, in one of the season finale's she wanted to find out who her father was but Maleficent couldn't remember because it happened in her dragon form and she told Emma she wanted to find him.

One more thing, did they ever mention who, "the Dragon" was in their realm? When I saw him in his dragon form I imagined he was Once Upon a Time's version of Mushu