Having a daughter makes parents more liberal than having a son.

In Germany, two-thirds of people who switched their political affiliation in the year after having a son moved to the more conservative party. The ratio was flipped for those who had a daughter.

In Britain, the two left of center parties, Labor and the Liberal Democrats, do much better — 11 percentage points — among voters with three girls and no boys than among voters with three boys and no girls.

How is this surprising?