Fanon talk:Regan Capp (C.Syde)/@comment-92.19.88.103-20141230221342/@comment-24258073-20141231005032

Antonia has Regan's full face and jaw, and Cornwall's eyebrows, eyes, nose and mouth. So she's not as similar to Regan as she looks.

But Cornwall and Regan have almost the same nose and mouth, so it's understandable how Antonia came to look a lot like Regan.