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Debbie is Ethan's daughter
Ethan and Martha had an affair many years ago, resulting in the birth of Debbie. Even after the war, Ethan stayed away from his brother's family to avoid dealing with the situation. When Debbie is taken by the Native Americans, Ethan is hell-bent on finding her — and killing her — because he can't bear the thought of his own flesh and blood becoming like the natives he hates so much.