Tracy, who was the only sibling to find out she did not have the gene, said: "They told me my results first, so I just thought we would all be the same.
UTracy, okwakunguye kuphela azalana naye ozothola ukuthi ubengenayo i-gene, uthe: "Bangitshele imiphumela yami kuqala, ngakho ngivele ngabona ukuthi sonke singafana.