Clair Smith, 36, and her sons Ben, nine, and Aron, one, were found stabbed at their home in Pudsey on Sunday.

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One episode was based in part on Susan Smith, the South Carolina mother who killed her two young sons by driving her car into a lake with them strapped inside.

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Mr Smith said they had thanked Foreign Secretary David Miliband for the work done on their sons' behalf.

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