re: Got one question about the white walkers?

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I don't think this is true. Certainly not in the show. Craster's sons are very possibly a part of the army of the dead, but we don't have any real evidence that it's made up of exclusively Craster's sons.

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Craster's son's are turned in to WW by the NK, the show shows this. Remember the baby and his eyes turning blue when the NK performed his ritual?

The army is just random dead, raised by a WW or the NK.