In the course of their child's school years, a group of parents were asked to assess their child's mathematical competence and indicate whether they endorsed the gender stereotype pertaining to it. Once the child had entered upper primary school, the consistent stereotypic parents tended to rate their boys' mathematical competence higher than the parents of girls did. Additionally, the parents whose attitude turned into an anti-stereotypical one perceived their girls' mathematical competencies as higher than those of the boys, which was related to their perception that the boys' competencies were getting worse while the girls' competencies were getting better.