Having Daughters Rather Than Sons Makes You More Liberal

Warner and Steel (1991, 1999) study American and Canadian mothers and fathers, and find that parents with daughters are more likely to support policies for gender equity.  Dads with daughters, for example, are more likely to hold feminist views –to favor affirmative action, for example.

Another study looks at dads in Congress.  Washington (2004) finds persuasive evidence that congressmen with female children tend to vote liberally on reproductive rights issues such as teen access to contraceptives. In a revision, Washington (2008) argues for a wider result, namely, that the congressmen vote more liberally on a range of issues such as working families flexibility and tax-free education.

See full details at FiveThirtyEight: Politics Done Right: Having Daughters Rather Than Sons Makes You More Liberal.