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  • 1 Department of Psychology, School of Humanities and Social Sciences, Waseda University, 1-24-1 Toyama Shinjuku-ku, Tokyo, 162-8644, Japan
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Abstract

The purpose of the study was to examine whether coresidence with parents affects the reproductive success of daughters in modern Japanese society. In Study 1, I tested whether women who were living with parents at the time of marriage would experience earlier first childbirth. In Study 2, I tested whether women who were living with parents when their firstborn child was young would experience earlier second childbirth. Cox regression models were used to estimate the relative risk of reproduction, taking into account several potential confounders. The results indicated that parents-in-law, especially mothers-in-law (i.e., the husband's mother), exerted the strong positive effects on the reproduction of daughters. These findings imply that, in a traditionally patrilocal country such as Japan, the relationship between mother- and daughter-in-law influences reproductive success more than that between biological mother and daughter. It is thus necessary to consider cultural context when testing the impact of grandparental investment in modern society.

  • S. N. Austad 1997 Why We Age: What Science is Discovering about the Body's Journey through Life John Wiley and Sons, Inc New York.

  • T. Bereczkei 1998 Kinship network, direct childcare, and fertility among Hungarians and Gypsies Evolution and Human Behavior 19 283 298.

    • Search Google Scholar
    • Export Citation
  • D. F. Bjorklund A. D. Pellegrini 2002 The Origins of Human Nature: Evolutionary Developmental Psychology American Psychological Association Washington, DC.

    • Search Google Scholar
    • Export Citation
  • D. A. Coall R. Hertwig 2010 Grandparental investment: Past, present, and future Behavioral and Brain Science 33 1 19.

  • Del Boca, D., Pasqua, S. and Pronzato, C. (2004): Employment and fertility decisions in Italy, France and the U. K. Child (Working Papers wp08_04). Centre for Household, Income, Labour and Demographic Economics — Italy.

    • Search Google Scholar
    • Export Citation
  • D. Friedman M. Hechter D. Kreager 2008 A theory of the value of grandchildren Rationality and Society 20 31 63.

  • M. Getachew F. Alemseged M. Abera A. Deribew 2010 Factors affecting fertility decisions of married men and women living with HIV in South Wollo Zone, Northeast Ethiopia Ethiopian Journal of Health Development 24 214 220.

    • Search Google Scholar
    • Export Citation
  • K. Hank M. Kreyenfeld 2003 A multilevel analysis of child care and women's fertility decisions in western Germany Journal of Marriage and Family 65 584 596.

    • Search Google Scholar
    • Export Citation
  • K. Hawkes J. F. O'Connell N. G. Blurton Jones 1997 Hadza women's time allocation, offspring provisioning, and the evolution of long postmenopausal life spans Current Anthropology 38 551 578.

    • Search Google Scholar
    • Export Citation
  • K. Hawkes J. F. O'Connell N. G. Jones H. Alvarez E. L. Charnov 1998 Grandmothering, menopause, and the evolution of human life histories Proceedings of the National Academies of Science USA 95 1336 1339.

    • Search Google Scholar
    • Export Citation
  • S. B. Hrdy 1999 Mother Nature: Natural Selection and the Female of the Species Chatti and Windus London.

  • M. Lahdenpera V. Lummaa S. Helle M. Tremblay A. F. Russell 2004 Fitness benefits of prolonged post-reproductive lifespan in women Nature 428 178 181.

    • Search Google Scholar
    • Export Citation
  • G. Ochiltree 2006 The changing role of grandparents AFRC Briefing 2 1 9.

  • A. Pashos 2000 Does paternity uncertainty explain discriminative grandparental solicitude? A cross-cultural study in Greece and Germany Evolution and Human Behavior 21 97 109.

    • Search Google Scholar
    • Export Citation
  • R Development Core Team 2011 R: A Language and Environment for Statistical Computing R Foundation for Statistical Computing Vienna, Austria.

    • Search Google Scholar
    • Export Citation
  • S. Randall T. Legrand 2003 Reproductive strategies and decisions in Senegal: the role of child mortality Population 58 687 715.

  • R. Sear D. Coall 2011 How much does family matter? Cooperative breeding and the demographic transition Population and Development Review. 37 s1 81 112.

    • Search Google Scholar
    • Export Citation
  • R. Sear R. Mace 2008 Who keeps children alive? A review of the effects of kin on child survival Evolution and Human Behavior 29 1 18.

  • R. Sear R. Mace I. A. Mcgregor 2000 Maternal grandmothers improve the nutritional status and survival of children in rural Gambia Proceedings of the Royal Society: Biological Sciences 267 1641 1647.

    • Search Google Scholar
    • Export Citation
  • P. W. Sherman 1998 The evolution of menopause Nature 392 759 761.

  • G. W. Skinner 2004 Grandparental effects on reproductive strategizing: Nôbi villagers in early modern Japan Demographic Research 11 111 148.

    • Search Google Scholar
    • Export Citation
  • D. A. Symons 1989 A critique of Darwinian anthropology Ethology and Sociobiology 10 131 144.

  • N. O. Tsuya L. L. Bumpass 2004 Introduction N. O. Tsuya L. L. Bumpass Marriage, work, and family life in comparative perspective: Japan, South Korea, and the United States University of Hawaii Press Honolulu, HI 1 18.

    • Search Google Scholar
    • Export Citation
  • P. W. Turke 1989 Evolution and the demand for children Population and Development Review 15 61 90.

  • E. Voland J. Beise 2005 The husband's mother is the devil in house: Data on the impact of the mother-in-law on stillbirth mortality in historical Krummhörn (1750–1874) and some thoughts on the evolution of postgenerative female life E. Voland A. Chasiotis W. Schiefenhövel Grandmotherhood: The evolutionary significance of the second half of female life Rutgers University Press New Brunswick and London 239 255.

    • Search Google Scholar
    • Export Citation
  • G. C. Williams 1957 Pleiotropy, natural selection, and the evolution of senescence Evolution 11 398 411.