AMS v AIF

The High Court of Australia considered appeals in two related matters, AMS v AIF and AIF v AMS. The dispute concerned guardianship and custody orders for a child born in the Northern Territory to parents then residing there. The mother sought to relocate with the child to Darwin, while the father sought to restrain her from removing the child from Western Australia. The proceedings involved the application of both Commonwealth and Western Australian legislation concerning family law and the exercise of federal jurisdiction.

The primary legal issues before the High Court were whether the *Family Law Act 1975* (Cth) was inconsistent with the *Family Court Act 1975* (WA) regarding child guardianship and custody, and whether the Family Court of Western Australia was exercising federal jurisdiction when making orders under the Commonwealth Act. The Court also considered whether a provision of the *Northern Territory (Self-Government) Act 1978* (Cth) was inconsistent with the exercise of judicial discretion under the Western Australian Act, and whether any such inconsistency impeded freedom of interstate intercourse. Furthermore, the Court examined whether an order restraining a custodial parent from changing a child's principal place of residence was an error of law, particularly if it required "compelling reasons" for relocation.

The High Court reasoned that the *Family Law Act 1975* (Cth) was the paramount legislation governing federal jurisdiction in family law matters, and that the Family Court of Western Australia, when exercising powers conferred by the Commonwealth Act, was indeed exercising federal jurisdiction. The Court found that the Western Australian Supreme Court's Full Court had erred in its approach to the mother's cross-appeal concerning the residence order. The High Court determined that the trial judge's order restraining the mother from changing the child's principal place of residence from the Perth metropolitan area was an error of law, as it imposed a restriction that was not necessarily required to achieve the legislative object of the child's welfare. The Court also addressed the constitutional questions regarding inconsistency between Commonwealth and State laws and the nexus between Commonwealth law and children born in Territories.

In both matters, the High Court allowed the appeals, set aside the orders of the Full Court of the Supreme Court of Western Australia, and set aside the orders of the Family Court of Western Australia. The matters were remitted to the Family Court of Western Australia for rehearing. Each party was ordered to pay their own costs in the Family Court, the Full Court of the Supreme Court, and the High Court.