In maintenance variation applications, the court must balance the means of the responsible person against the needs of the children, with the children's best interests being paramount in accordance with section 81 of the Constitution. The use of child maintenance by a custodial parent for their own benefit (such as paying their own rental accommodation) amounts to economic exploitation, neglect and abuse of the child prohibited by section 81(e) of the Constitution. When children are boarders at school, maintenance may be reduced during school terms when shelter and food are provided by the school, but not eliminated, as children still require appropriate accommodation when visiting the custodial parent. Courts must preserve children's established standard of education and living, and should not permit transfers to inferior schools merely to maintain higher maintenance payments. Both parents have a duty to contribute to their own support where able, as required by the maintenance legislation. Custody is a serious matter requiring proper ventilation and careful consideration of the child's best interests, and cannot be granted through casual concessions made in affidavits in unrelated maintenance proceedings.