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  1. Alternatives to the Grandmother Hypothesis.Beverly I. Strassmann & Wendy M. Garrard - 2011 - Human Nature 22 (1-2):201-222.
    We conducted a meta-analysis of 17 studies that tested for an association between grandparental survival and grandchild survival in patrilineal populations. Using two different methodologies, we found that the survival of the maternal grandmother and grandfather, but not the paternal grandmother and grandfather, was associated with decreased grandoffspring mortality. These results are consistent with the findings of psychological studies in developed countries (Coall and Hertwig Behavioral and Brain Sciences 33:1-59, 2010). When tested against the predictions of five hypotheses (confidence of (...)
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  • Grandparental investment: Past, present, and future.David A. Coall & Ralph Hertwig - 2010 - Behavioral and Brain Sciences 33 (1):1-19.
    What motivates grandparents to their altruism? We review answers from evolutionary theory, sociology, and economics. Sometimes in direct conflict with each other, these accounts of grandparental investment exist side-by-side, with little or no theoretical integration. They all account for some of the data, and none account for all of it. We call for a more comprehensive theoretical framework of grandparental investment that addresses its proximate and ultimate causes, and its variability due to lineage, values, norms, institutions (e.g., inheritance laws), and (...)
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  • Grandparental investment facilitates harmonization of work and family in employed parents: A lifespan psychological perspective.Christiane A. Hoppmann & Petra L. Klumb - 2010 - Behavioral and Brain Sciences 33 (1):27-28.
    The target article emphasizes the need to identify psychological mechanisms underlying grandparental investment, particularly in low-risk family contexts. We extend this approach by addressing the changing demands of balancing work and family in low-risk families. Taking a lifespan psychological perspective, we identify additional motivators and potential benefits of grandparental investment for grandparents themselves and for subsequent generations.
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  • Discriminative Grandparental Investment in China.Liqun Luo, Yinan Zuo & Xinzhu Xiong - 2024 - Human Nature 35 (1):21-42.
    Many studies in Western societies show a pattern of discriminative grandparental investment as follows: maternal grandmothers (MGMs) > maternal grandfathers (MGFs) > paternal grandmothers (PGMs) > paternal grandfathers (PGFs). This pattern is in line with the expectation from evolutionary reasoning. Yet whether or not this pattern applies in China is in question. The present study was based on a questionnaire survey at a university in Central China (N = 1,195). Results show that (1) when grandparent–grandchild residential distance during grandchildren’s childhood (...)
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  • Grandparental Effects on Fertility Vary by Lineage in the United Kingdom.Antti O. Tanskanen, Markus Jokela, Mirkka Danielsbacka & Anna Rotkirch - 2014 - Human Nature 25 (2):269-284.
    Grandparental presence is known to correlate with the number of grandchildren born, and this effect may vary according to grandparental sex and lineage. However, existing studies of grandparental effects on fertility mostly concern traditional subsistence societies, while evidence from contemporary developed societies is both scarce and mixed. Here, we explore how grandparents affect the transition to second and subsequent children in the contemporary United Kingdom. The longitudinal Millennium Cohort Study (n = 10,295 families) was used to study the association between (...)
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  • With the Help of Kin?Paul P. P. Rotering & Hilde Bras - 2015 - Human Nature 26 (1):102-121.
    Relatives play an important role in human reproduction according to evolutionary theories of reproductive behavior, but previous empirical studies show large differences in the effects of kin on fertility outcomes. In our paper we examine the effect of co-resident kin and non-kin on the length of birth intervals over the reproductive life course of Dutch women born between 1842 and 1920. We estimate Cox proportional hazard models for parity progression based on the presence of kin and non-kin in the household (...)
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  • The evolutionary versus socio-economic view on grandparenthood: What are the grandparents' underlying motivations?Alexander Pashos - 2010 - Behavioral and Brain Sciences 33 (1):33-34.
    Coall & Hertwig (C&H) give an ambitious review about the broad range of grandparenting literature from the perspective of different disciplines. They aim to show, how evolutionary theory, sociology, and economics can mutually enrich each other. However, the differences between the evolutionary and the socio-economic perspective should be more clearly pointed out, because they usually deal with different research questions. Grandparents' well-being could be divided into its underlying components.
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  • The generation game is the cooperation game: The role of grandparents in the timing of reproduction.Rebecca Sear & Thomas E. Dickins - 2010 - Behavioral and Brain Sciences 33 (1):34-35.
    Coall & Hertwig (C&H) demonstrate the importance of grandparents to children, even in low fertility societies. We suggest policy-makers interested in reproductive timing in such contexts should be alerted to the practical applications of this cooperative breeding framework. The presence or absence of a supportive kin network could help explain why some women begin their reproductive careers or.
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  • Toward an integrative framework of grandparental investment.David A. Coall & Ralph Hertwig - 2010 - Behavioral and Brain Sciences 33 (1):40-59.
    This response outlines more reasons why we need the integrative framework of grandparental investments and intergenerational transfers that we advocated in the target article. We discusses obstacles that stand in the way of such a framework and of a better understanding of the effects of grandparenting in the developed world. We highlight new research directions that have emerged from the commentaries, and we end by discussing some of the things in our target article about which we may have been wrong.
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