Are couples with daughters more likely to divorce than couples with sons? Using Dutch registry and U.S. survey data, we show that couples with daughters face higher risks of divorce, but only when daughters are 13 to 18 years old. These age-specific results run counter to explanations involving overarching, time-invariant preferences for sons and sex-selection into live birth. We propose another explanation that involves relationship strains in families with teenage daughters. In subsample analyses, we find larger child-gender differences in divorce risks for parents whose attitudes towards gender-roles are likely to differ from those of their daughters and partners. We also find survey evidence of relationship strains in families with teenage daughters.