The effect of parenthood on voting behaviour has been so far largely neglected in electoral research, and is usually assumed to have a negligible effect. However, the 2021 German federal election campaign faced the politicization of two main family- and children-related issues (i.e. COVID-19 pandemic and climate change). Based on a comparison of the 2017 and 2021 GLES post electoral surveys, we investigate the gendered effect of parenthood on voting behaviour. When controlling for education, age, religious denomination, religious services attendance, marital status and East/West Germany, our multinomial logistic regression analysis points to a significant parenthood effect for women with at least a child under 11 years old during the 2021 election: women with at least one child under the age of 11 have a more than 10 percentage point higher probability to vote for the Greens than women without underaged children at the 2021 election. Further analyses show that this effect can be explained by the larger importance allocated by women of young children to the climate change issue. We conclude by highlighting the potential relevance of parents as electorate force when family- and children-related issues are politicized during electoral campaigns.