The heritability of political views increases with age. Young people initially adopt their parents' views but develop their own as they become more independent.

"The expression of genetic influences on political attitudes occurs at the time of early adulthood and persists throughout the adult years. [...] Offspring begin with the attitudes learned from their parents, but as they leave home, their own experiences and individual genetic disposition inter act to modify those attitudes."

https://www.journals.uchicago.edu/doi/10.1017/S0022381609090938