1954- 2014 biographies biography brown canada china democracy disabledchildren familyrelationships fathersandsons geneticdiseases geneticdisordersinchildren genetics hongkong huang ian inborn maladiesgénétiqueschezl'enfant parentsd'enfantshandicapés parentsofchildrenwithdisabilities patients personalnarratives politicalactivists politicsandgovernment protestmovements pèresetfils relationsfamiliales umbrellamovement walker zhifeng