This does seem to confirm that, like many have been speculating for awhile, Rapunzel is Wish!Hook’s daughter. The real question is who is Rapunzel *now* (Eloise Gardener, Tremaine, The Witch), who’s the mother, and what happened?
Seeing how young Wish Hook is, it could be a flashback. He and Rapunzel are about the same age, so it looks like Rapunzel could be his baby mama and not his baby.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy