R v Cook; Ex parte C

The High Court of Australia considered the validity of a provision of the *Family Law Act 1975* (Cth) in *R v Cook; Ex parte C*. The case involved an application made to the Family Court concerning the custody of an ex-nuptial child, who was deemed by the statute to be a child of a marriage. The central dispute concerned whether the Commonwealth Parliament had the constitutional power to legislate in this manner.

The primary legal issue before the High Court was whether section 5(1)(e)(i) of the *Family Law Act 1975* (Cth), which deemed an ex-nuptial child to be a child of a marriage for the purposes of the Act, was a valid exercise of the Commonwealth's legislative power under section 51(xxi) of the Constitution. This section grants the Parliament power to make laws with respect to "marriage".

The Court reasoned that the power to legislate with respect to "marriage" under section 51(xxi) of the Constitution extended to making laws concerning the consequences of marriage, including the status and custody of children born within or in connection with a marriage. The Court held that the provision deeming an ex-nuptial child to be a child of a marriage was a law with respect to marriage, as it regulated matters arising from the marital relationship and its dissolution. Consequently, the Court found the provision to be a valid exercise of the Commonwealth's constitutional power.

The High Court made absolute the order nisi for a writ of prohibition directed to the judges of the Family Court, prohibiting them from proceeding further in the application. The costs of the prosecutors and of the respondents Mr and Mrs T. were ordered to be paid by the Commonwealth.