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Mrs. Arlen's son
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- Mrs. Arlen's son is Juliet's nephew Julian. Carlson, Juliet's former last name and her sister's current one sounds very similar to Arlen. Both children are the same age. Considering how common connections are between characters on the show this could be likely.
- Also, Rachel (Juliet's sister) could have gotten married to a Mr. Arlen.
- He is Zack.
- Zack didn't leave the island.
- Zack could leave the island in the future.