I think it is a plot driven show that focused mainly on the sisters. Given that premise i think the other character should be understood as a supporting cast that help the story along. And for that, I think they got plenty of screentime, even their own storylines like Juliet for example.
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Happy thoughts,
Nina
You might want to rethink marrying the lines "Kids are dead! Kids are dead!" ("Happy days are here again.").
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