This study examines sex differences in expressed attitudes of parents and students towards primary school mathematics before and after involvement in a Family Maths Program. The study involved the families of Year 3 and 4 students at a Catholic primary school in the ACT, and used an illuminative evaluation methodology. Results suggest that: the effects of running a Family Maths Program were not confined to the parents and children who attended the formal sessions; at this primary school, mothers have a more active involvement than fathers in the development of attitudes to maths; and there is need for a more integrated approach to the use of calculators and computers in the mathematics curriculum at this school.