In the study published by Sociological Forum, Dalton Conley of New York University and Emily Rauscher of the University of Kansas find that having more daughters than sons and having a daughter first “significantly reduces the likelihood of Democratic identification and significantly increases the strength of Republican Party identification.”
They found that overall, “compared to those with no daughters, parents with all daughters are 14% less likely to identify as a Democrat… and 11% more likely to identify as a Republican than parents with no daughters.”
Pew Research: “The daughters effect is considerably stronger among better educated and
wealthier parents, they find. But among those farther down the
socioeconomic ladder, it weakens to statistical insignificance.”