I think its more likely that they were orphans after the crash and ana lucia was acting like a mother to them. Either way, the kids being taken is prolly a major reason why ana lucia is the way she is.

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\"We\'re not alone on this Island and we all KNOW IT\" - John Locke

Locke: Why do you find it so hard to believe?
Jack: Why do you find it so easy?
Locke: It\'s never been easy.