Related: Parents who are nice to their kids and not excessively controlling are more successful in passing on their political ideology, left-wing or right-wing.

A valuable lesson for right-wingers, who are more inclined toward authoritarian parenting!

As with all behavior, political views are about ~50% heritable (varies with age, political awareness, etc.), meaning they are influenced by genes that predispose individuals toward certain views. However, this still leaves a lot of room for environmental influences.