I think I like the idea they are not brothers by blood but from the spinners, and that somehow Peter got mixed up with fairies. That will partially ex[lain why Rumple is so convinced fairies are evil.
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“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass