(1) Without limiting who is a child of a person for the purposes of this Act, each of the following is the child of a person:
(a) someone who is a child of the person within the meaning of the Family Law Act 1975 (other than someone who is an adopted child of the person within the meaning of that Act);
(b) someone who is an adopted child of the person within the meaning of this Act.
(2) The regulations may provide that, for the purposes of this Act, a person specified by the regulations is not a child of another person specified by the regulations in circumstances in which the person would, apart from this subsection, be the child of more than 2 persons for the purposes of this Act.
(3) Subsection (2), and regulations made for the purposes of that subsection, have effect whether the person specified as not being a child of another person would, apart from that subsection and those regulations, be the child of the other person because of subsection (1) or otherwise.