Using administrative data from Taiwan, this paper provides causal evidence of an intergenerational spillover effect stemming from a child’s financial education to their parents’ financial decisions. Specifically, after the child enters college, parents with a child majoring in finance exhibit higher stock market participation rates compared to those with children in other majors. This finding highlights the transfer of financial literacy from offspring to parents. Notably, this effect is more pronounced in households with only one child and particularly when neither parent has prior stock market participation experience. Furthermore, mothers appear to be more susceptible to this intergenerational spillover. These results emphasize the role of offspring in shaping parents' and household financial behaviors. Future research in household finance might benefit from considering this factor.