I know we talked about this before, and maybe the writers tweeted something to suggest it, but maybe the Dark Magic in Henry’s life is Regina’s influence. She is the mom with a Dark Heart who raised him. I can’t remember where that was though or if they confirmed but most certainly it could be in various senses beyond genetics.
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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