Grandparental investment and reproductive success in modern Japanese society

Yasuyuki Fukukawa*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)35-48
Number of pages14
JournalJournal of Evolutionary Psychology
Issue number1
Publication statusPublished - 2013 Mar 1


  • coresidence with parents
  • grandmother hypothesis
  • grandparental investment
  • inclusive fitness
  • reproductive success

ASJC Scopus subject areas

  • Social Psychology
  • Ecology, Evolution, Behavior and Systematics
  • Experimental and Cognitive Psychology
  • Anthropology


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