I really don’t think Regina secretly had a daughter named Drizella that she forgot to tell Henry about. It’s just a coincidence that Lana and Adeline look similar here. I think the fact that they have similar costumes is merely down to the costume designer looking for inspiration from previous seasons because Regina has had some awesome dresses.
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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