Hogfather - Parents

Something began when the Guild of Assassins enrolled Mister Teatime, who saw things differently from other people, and one of the ways that he saw things differently from other people was in seeing other people as things (later, Lord Downey of the Guild said, 'We took pity on him because he'd lost both parents at an early age. I think that, on reflection, we should have wondered a bit more about that.')

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Hogfather - p10