Evidence suggests having daughters makes parents more feminist...

From FiveThirtyEight:

Having Daughters Rather Than Sons Makes You More Liberal

Interesting Excerpts:

The authors' key finding is that support for policies designed to address gender equity is greater among parents with daughters. This result emerges particularly strongly for fathers.

This is very interesting:

By collecting data on the voting records of US congressmen, Washington (2004) is able to go beyond this. She provides 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.