The biological bond between the Deveraux daughters girls makes their rivalry more intense. Miller dished:
There’s this interesting dynamic where Abigail and Gwen are [half] sisters. They share 50% of the same DNA [through Jack, played by Matthew Ashford]. Sisters really just know how to get at each other.
I don’t live near my [real-life] sister but it’s not unusual for us to show up [at an event] where we are wearing the same outfit. We’d each bought what we’re wearing on completely different days. We live in different states. We do weird [coincidental] stuff like that. There’s something about siblings. You’re operating on a different level.
Gwen might just deliver some barbs that really get to Abby. Miller mused:
Gwen knows how to get under Abby’s skin and she’s not afraid to play dirty. She pulls out hard stuff. It’s so fun to play because Emily is such a talented person. There’s something about her accent and British sensibility — the way it lands [in scenes]. She really kills it.