scholarly journals Kin Investment by Step-Grandparents—More Than Expected

2016 ◽  
Vol 14 (1) ◽  
pp. 147470491663121 ◽  
Author(s):  
Alexander Pashos ◽  
Sascha Schwarz ◽  
David F. Bjorklund
Keyword(s):  
Kin Investment

Mom always liked me better: The impact of parent--child resemblance on kin investment

2011 ◽  
Author(s):  
Alex Z. Gold ◽  
David S. Friedman ◽  
Jacklyn M. Sullivan ◽  
Stephen Sullivan
Keyword(s):  
Kin Investment ◽  
The Impact ◽  
Parent Child

Kin investment in wage-labor economies

Human Nature ◽  
2005 ◽  
Vol 16 (1) ◽  
pp. 81-113 ◽  
Author(s):  
Mary K. Shenk
Keyword(s):  
Wage Labor ◽  
Kin Investment

scholarly journals Grandma plays favourites: X-chromosome relatedness and sex-specific childhood mortality

2009 ◽  
Vol 277 (1681) ◽  
pp. 567-573 ◽  
Author(s):  
Molly Fox ◽  
Rebecca Sear ◽  
Jan Beise ◽  
Gillian Ragsdale ◽  
Eckart Voland ◽  
...  
Keyword(s):  
X Chromosome ◽  
Genetic Relatedness ◽  
Family Members ◽  
Childhood Mortality ◽  
Human Populations ◽  
Kin Investment ◽  
Grandmother Hypothesis ◽  
New Perspective ◽  
Post Menopausal ◽  
Developmental Traits

Biologists use genetic relatedness between family members to explain the evolution of many behavioural and developmental traits in humans, including altruism, kin investment and longevity. Women's post-menopausal longevity in particular is linked to genetic relatedness between family members. According to the ‘grandmother hypothesis’, post-menopausal women can increase their genetic contribution to future generations by increasing the survivorship of their grandchildren. While some demographic studies have found evidence for this, others have found little support for it. Here, we re-model the predictions of the grandmother hypothesis by examining the genetic relatedness between grandmothers and grandchildren. We use this new model to re-evaluate the grandmother effect in seven previously studied human populations. Boys and girls differ in the per cent of genes they share with maternal versus paternal grandmothers because of differences in X-chromosome inheritance. Here, we demonstrate a relationship between X-chromosome inheritance and grandchild mortality in the presence of a grandmother. With this sex-specific and X-chromosome approach to interpreting mortality rates, we provide a new perspective on the prevailing theory for the evolution of human female longevity. This approach yields more consistent support for the grandmother hypothesis, and has implications for the study of human evolution.

Inheritance of wealth as human kin investment

1987 ◽  
Vol 8 (3) ◽  
pp. 171-182 ◽  
Author(s):  
Martin S. Smith ◽  
Bradley J. Kish ◽  
Charles B. Crawford
Keyword(s):  
Kin Investment

scholarly journals Human Kin Investment as a Function of Genetic Relatedness and Lineage

2004 ◽  
Vol 2 (1) ◽  
pp. 147470490400200 ◽  
Author(s):  
Gregory D. Webster
Keyword(s):  
Genetic Relatedness ◽  
Kin Investment

scholarly journals Kin recognition and step-paternal investment: the effect of childhood co-residence duration

2021 ◽  
Author(s):  
jenni pettay ◽  
Mirkka Danielsbacka ◽  
Samuli Helle ◽  
Antti O Tanskanen
Keyword(s):  
Emotional Support ◽  
Kin Recognition ◽  
Paternal Investment ◽  
Panel Analysis ◽  
Emotional Closeness ◽  
Kin Investment ◽  
Adolescents And Adults ◽  
Intergenerational Altruism ◽  
Indirect Cues ◽  
Biological Fathers

Evolutionarily relevant nepotistic kin investment requires reliable kin detection. Evolutionary scholars have argued that childhood co-residence is one of the most important indirect cues for kinship. While childhood co-residence duration has been found to correlate with kin investment in intragenerational studies (i.e., among siblings), intergenerational investigations considering the association between childhood co-residence duration and kin investment have been scarce. Here, we investigate whether the investment of biological and stepfathers is correlated with childhood co-residence duration. We used data from adolescents and adults (aged 17–19, 27–29, and 37–39 years) from the German Panel Analysis of Intimate Relationships and Family Dynamics (Pairfam), wave 2, collected in 2010–2011. Paternal investment was measured as financial and practical help, emotional support, intimacy, and emotional closeness. We found that while stepfathers invested less than biological fathers, both biological and stepfathers’ investments increased with increased childhood co-residence duration in most measures. Financial help correlated with childhood co-residence in stepfathers but not in biological fathers who helped financially more than stepfathers regardless of childhood co-residence duration. Emotional support, intimacy, and emotional closeness were correlated with childhood co-residence in both biological fathers and stepfathers. Practical help did not correlate with co-residence in either father. Thus, our results partially support the hypothesis that childhood co-residence duration serves as a kin detection cue and directs intergenerational altruism.

Lineage, Sex, and Wealth as Moderators of Kin Investment

Human Nature ◽  
2008 ◽  
Vol 19 (2) ◽  
pp. 189-210 ◽  
Author(s):  
Gregory D. Webster ◽  
Angela Bryan ◽  
Charles B. Crawford ◽  
Lisa McCarthy ◽  
Brandy H. Cohen
Keyword(s):  
Kin Investment

scholarly journals Altruism towards cousins

2007 ◽  
Vol 274 (1614) ◽  
pp. 1181-1187 ◽  
Author(s):  
Joonghwan Jeon ◽  
David M Buss
Keyword(s):  
Mathematical Model ◽  
Empirical Study ◽  
Empathic Concern ◽  
Psychological Variables ◽  
Emotional Closeness ◽  
Paternity Uncertainty ◽  
Kin Investment ◽  
Contact Frequency ◽  
Willingness To Help ◽  
Special Case

Recent research on kin investment shows a matrilateral bias as a function of paternity uncertainty. Kin investment, however, is a special case of kin altruism. We thus hypothesize that psychological adaptations have evolved to regulate cousin-directed altruism according to predictably variable levels of paternity uncertainty in different categories of cousins. We develop a formal mathematical model that predicts that individuals should be most willing to act altruistically towards their mother's sister's (MoSis) children and least willing to act altruistically towards their father's brother's (FaBro) children. Altruism towards father's sister's (FaSis) and mother's brother's (MoBro) children are predicted to fall in between. An empirical study ( N =195), assessing expressed altruistic proclivities, confirmed the predictions from the model. Participants expressed willingness-to-help following the descending order: (i) MoSis children, (ii) MoBro children, (iii) FaSis children, and (iv) FaBro children. The psychological variables of emotional closeness, empathic concern and contact frequency showed precisely the same pattern across distinct cousins, providing convergent confirmation of the model. The results support the hypothesis of cousin-specific adaptations sensitive to varying probabilities of paternity uncertainty.

Parent–child resemblance and kin investment: Physical resemblance or personality similarity?

2009 ◽  
Vol 6 (1) ◽  
pp. 64-69 ◽  
Author(s):  
Marianne Heijkoop ◽  
Judith Semon Dubas ◽  
Marcel A. G. van Aken
Keyword(s):  
Kin Investment ◽  
Personality Similarity ◽  
Physical Resemblance ◽  
Parent Child

Hamilton’s Rule and Kin Investment

2017 ◽  
pp. 1-2
Author(s):  
Hans Hämäläinen ◽  
Antti O. Tanskanen ◽  
Mirkka Danielsbacka
Keyword(s):  
Hamilton’S Rule ◽  
Kin Investment ◽  
Hamilton's Rule
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