The binding legal principle established is that 'parent' in s 40(1) of the South African Schools Act 84 of 1996, read with the definition in s 1, includes both custodian and non-custodian biological parents. A non-custodian biological father is a 'parent' for purposes of liability for school fees under the Act. The plain and ordinary meaning of 'parent' in s 1(a) of the Act encompasses biological parents regardless of custody status. The three sub-definitions in s 1 (a), (b) and (c) must each bear different meanings to avoid rendering any superfluous. Where the legislature intended to distinguish between types of parents (such as custodian parents), it did so explicitly elsewhere in the Act (e.g., s 3). The unqualified use of 'parent' in s 40(1) indicates that all categories of parents defined in s 1 are included. This interpretation is consistent with the common law duty of both parents to support their children, the constitutional principle of the best interests of the child (s 28(2)), and the constitutional value of gender equality.