Board Thread:Character Discussion/@comment-14210692-20131022025420/@comment-1293767-20131027060328

I wondered if they were brothers as well. (And I hope not, I like the idea of them being friends instead of a familial relation.) If anything, the "even your own father" line suggested to me that they could be full brothers.

Basically, their father abandons them and Peter is so angry about it that he disowns his father (and, probably, mother as well unless something different happened to her) and wants Rumple to as well. In his utopia, he and Rumple are all each other has. But Rumple doesn't want to do that, he clings to the hope that his father will come back/change and this further infuriates Peter, so he disowns Rumple as well and goes to Neverland where he comes a forever child/the original Lost Boy and continues to hold a grudge against Rumple for choosing the father who abandoned them (and maybe even physically/emotionally abused them beforehand?) over him. (A parallel to Bae's anger at Rumple for choosing magic over him.)