In the Australian Election Study 2010 there is a question about the politics of the respondent’s parents. Though the generations don’t share politics as much as spouses, politics is not looking like a major source of division in family get-togethers. Labor politics seems particularly hereditary. About three-quarters of Labor identifiers in 2010 say that their parents were also Labor supporters. 30% of respondents did not know which party their parents supported.
The lower hereditary nature of Liberal politics reflects the well-known generational problems in Liberal support.
Among 2010 Green identifiers, a bit over a quarter have Liberal parents, and a bit under 40% have Labor parents.