The Wiz of Oz wrote:
If u look at every main villain (Rumple, Regina, Cora, and Pan) all have been related to Henry. It wont surprise if WWW is related to him I just hope is through Rumple and not Regina. I cant believe that Neal is Rumple's only child in 300 years and also Rumple only had 3 lovers his whole life. I'm thinking WWW is Rumple's child that he didnt know about VIA whoever is WWW mother
Oh yes, Rumple was the big reveal, that's true. After that, the big surprise was Pan.
I kind of don't count Cora as too strong or a surprising relation to Henry because only blood relations is what matters to me.
We've also known about Cora's existence as of S1E18 and it was clear back then she was Henry's step-grandmother.
Your theory of WWW as Rumple's child is the most plausible and logical. In 300 years only one child and 3 lovers? Rumple knows better than that.
I am hoping for more family members, like Cora's mother, Rumple's mother etc.