Abstract This study examines the influence of grandchildren’s sex on grandparents’ voting behaviour by using independently collected individual-level data. The survey was conducted immediately after the 2016 House of Councillors election in Japan. It was found that individuals who had a granddaughter were more likely to vote for female candidates by a 10 per cent margin compared to those who did not. However, having a daughter did not affect parents’ voting behaviour. Furthermore, having a son or grandson also did not influence grandparents’ voting behaviour. This finding implies that grandparents vote with their granddaughters’ future benefits in mind, because granddaughters may be too young to vote in a male-dominated and ageing society.
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