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The boys begin as innocent children who love their mother. (Chapters 1-2)
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Their arguments turn physical and the eldest brother wins out.
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The direction of their morality changes as the boys begin to see their mother's flaws and argue over her morality.
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They venture into the woods and their darkest sides come out through their savage kill of the unicorn.
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The final descent into savagery happens when Gaheris kills his mother.
