1954- 1996- biographies biography brown canada childrenwithmentaldisabilities disabledchildren education enfantshandicapésmentaux familyrelationships fathersandsons geneticdiseases geneticdisordersinchildren genetics groupesdepression histoire history ian inborn maladiesgénétiqueschezl'enfant ontario parentsofchildrenwithdisabilities parentsofchildrenwithmentaldisabilities patients personalnarratives pressuregroups pèresetfils relationsfamiliales walker éducation