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3 kids in family struck by rare genetic disorder
Born bright and healthy, one died at age 10 while two others are paralysed and unable to talk
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Calvin Yang
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His three children were bright, bubbly and humorous. They could read and write at the age of three, when most children were only starting to recognise letters.
But as the trio grew up, they started speaking less, walked with great difficulty and began having uncontrolled seizures.
