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She abandoned him in Season 4, Episode 10: Something Nice Back Home. Her father (and Jack's father) Christian appears and she follows him into the jungle, leaving Aaron behind. In the cabin later, when John Locke asks Christian where Aaron is, Christian said Aaron (his grandson) is where he is supposed to be, apparently meaning that the baby is supposed to leave the island. When Claire appears to Kate in Aaron's bedroom back in Los Angeles, she orders Kate not to bring Aaron back to the island.

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