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This study explored the involvement of grandparents in the care for young children and its effect on subsequent child births in dual‐earner families, using data on 898 Dutch men and women aged 18–49 from the Netherlands' Kinship Panel Study. Three theoretical perspectives were used to develop hypotheses: (a) needs and opportunities, (b) normative preferences, and (c) gendered involvement of grandparents. The findings showed that needs and opportunities informed involvement of grandparents but that the availability of formal child care did not predict grandparents' involvement. Maternal grandparents were more likely to provide child care than paternal grandparents, and grandmothers were more likely to do so than grandfathers. Involvement of both maternal and paternal grandparents in turn increased the likelihood of additional child births. The authors conclude that grandparental child care may be part of an emerging reproductive strategy. Implications of these findings for the theoretical approaches used are discussed.

SummaryThis study tests two evolutionary hypotheses on grandparental investments differentiated by the child's sex: the paternity uncertainty hypothesis and the Trivers–Willard hypothesis. Data are from two culturally different countries: the Dutch Longitudinal Aging Study Amsterdam (n=2375) and the Chinese Anhui Survey (n=4026). In the Netherlands, grandparental investments are biased towards daughters' children, which is in accordance with the paternity uncertainty hypothesis. But in China, grandparental investments are biased towards sons' children, which is in conflict with the paternity uncertainty hypothesis. This study found no support for the Trivers–Willard hypothesis. These results raise doubts over the relevance of paternity uncertainty as an explanation of a grandparental investment bias towards daughters' children that is often found in Western populations. The results suggest that discriminative grandparental investments are better understood as the outcome of cultural prescriptions and economic motives.

Populations around the globe are ageing rapidly. This demographic shift affects families, market structures and social provisions. This timely volume, part of the Ageing and the Lifecourse series, argues that the lifecourse perspective helps us understand the causes and effects of population ageing. The lifecourse perspective suggests that individuals' experiences at an early age can influence their decisions and behaviour at a later age. This much-needed volume combines insights from different disciplines and real-life experiences to describe the theories and practices behind this idea. It therefore caters to the needs of scholars, practitioners and policy makers in a range of areas including sociology and political science