(1) Subject to this section and section 69ZF, this Part extends to New South Wales, Victoria, Queensland, South Australia and Tasmania.
(2) Subject to this section and section 69ZF, this Part extends to Western Australia if:
(a) the Parliament of Western Australia refers to the Parliament of the Commonwealth the following matters or matters that include, or are included in, the following matters:
(i) the maintenance of children and the payment of expenses in relation to children or child bearing;
(ii) parental responsibility for children; or
(b) Western Australia adopts this Part.
(3) This Part extends to a State under subsection (1) or (2) only for so long as there is in force:
(a) an Act of the Parliament of the State by which there is referred to the Parliament of the Commonwealth:
(i) the matters referred to in subparagraphs (2)(a)(i) and (ii); or
(ii) matters that include, or are included in, those matters; or
(b) a law of the State adopting this Part.
(4) This Part extends to a State at any time under subsection (1) or paragraph (2)(a) only in so far as it makes provision with respect to:
(a) the matters that are at that time referred to the Parliament of the Commonwealth by the Parliament of the State; or
(b) matters incidental to the execution of any power vested by the Constitution in the Parliament of the Commonwealth in relation to those matters.