Emma was only the only one who could break the curse because of Rumble adding to the parchment in “Land Without Magic” — Season 1×22
So I don’t think Henry has any magic, only Emma.
He tells her that the True Love magic he was able to create from the strands of her parents’ hair was so powerful that, as he was making the Dark Curse, he placed a single drop of it on the parchment as a precaution. Emma realizes that’s why she’s The Savior—the only one who can break The Curse.
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