I didn’t think of them as brother and sister, but it’s an interesting idea. If they were brother and sister, though, you’d think grace being her niece might have come up. Obviously not in an actually loving aunt sort of way, but a uninterested “how is my niece?” seems likely instead of just calling her “your daughter” whenever she mentions him to jefferson.
Yeah point taken. She does stress the importance of family. Grace/ Paige is always refered to as your daughter. Then it has to be a connection to Jefferson, Regina and the Queen of Hearts, whom we know not of her identity. I think its either her sister or Cora.