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Advances in Psychological Science    2013, Vol. 21 Issue (11) : 2082-2090     DOI: 10.3724/SP.J.1042.2013.02082
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Individual Differences in Grandparental Investment: An Evolutionary Psychological Perspective
WU Baopei;ZHU Xiaoqin;CHANG Lei
(1 School of Humanities & Social Sciences, Beijing Forestry University, Beijing 100083, China) (2 Department of Educational Psychology, The Chinese University of Hong Kong, Hong Kong, China)
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Abstract  

Grandparenting which is an important part of alloparenting for the prolonged development of human children has been practiced in both traditional and modern societies. We review the relevant evolutionary psychology literature to highlight some of the characteristics of human grandparenting. Among some of the well observed characteristics are the lineage differences in grandparenting. Specifically, maternal grandparents seem to invest more than paternal grandparents, and female grandparents seem to invest more than male grandparents. This observation is in line with the paternity uncertainty hypothesis whereby paternal parenting is regulated by paternity doubt a male parent has over his offspring. Less widely observed are emerging evidence suggesting grandparental investment differences due to the grandchild’s sex. This observation is explained by the sex-chromosome hypothesis in that a woman is least related to her paternal grandson, equally related to her maternal grandson and granddaughter, and most related to her paternal granddaughter. Other variables such as residential proximity and patrilocality may also shape the grandparental investment. Future studies should take the intergenerational conflict perspective to investigate inclusive fitness of grandparents and their grandchildren.

Keywords grandparental investment      pertanity uncertainty      lineage bias      sex bias      parental investment theory      kin selection theory      evolutionary psychology     
Corresponding Authors: CHANG Lei   
Issue Date: 15 November 2013
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WU Baopei
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CHANG Lei
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WU Baopei,ZHU Xiaoqin,CHANG Lei. Individual Differences in Grandparental Investment: An Evolutionary Psychological Perspective[J]. Advances in Psychological Science, 2013, 21(11): 2082-2090.
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http://journal.psych.ac.cn/xlkxjz/EN/10.3724/SP.J.1042.2013.02082     OR     http://journal.psych.ac.cn/xlkxjz/EN/Y2013/V21/I11/2082
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