I didn't read from the scene that she seemed happy to see her parents. Her mouth was drawn closed most of the time and her face was pretty expressionless - or at least "forced". Until the scene with her father, I thought it was mostly b/c she was upset that Jin wasn't with her or that she was anxious to tell them about the baby. (Think too about how she's going to explain how could she be pregnant with his baby... especially if "he never made it off the plane")

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