For the purposes of this Act, the members of a person's family are taken to include the following (without limitation):
(a) a de facto partner of the person (within the meaning of the Acts Interpretation Act 1901 );
(b) someone who is the child of the person, or of whom the person is the child, because of the definition of child in section 4;
(c) anyone else who would be a member of the person's family if someone mentioned in paragraph (a) or (b) is taken to be a member of the person's family.