A person who—
(a) is a parent of a child; and
(b) is of sound mind; and
(c) is, in the light of medical advice furnished by a medical practitioner, prepared to do so;may, by writing signed in the presence of a designated officer, consent to the removal from the body of the child of regenerative tissue specified in the consent, for the purpose of the transplantation of the tissue to the body of a brother, sister or parent of the child.