Just going off of what the actress and article said. Antiope is my fave and I'd love to see her girlfriend/wife. In my head it's just not Menalippe. *Kanye shrugs*

Greek mythology I believe so. I can't speak for the comics. All I know is that in the movie press kit the actress says she's their youngest sister.

They're sisters though. And I don't mean in the general amazon sisterly way. Menalippe is Antiope and Hippolyta's younger sister.