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SummaryKin selection theory predicts that individuals may increase their inclusive fitness by investing in their genetically related kin. In addition, according to the reproductive value hypothesis, individuals may increase their fitness more by investing in their kin in descending rather than ascending order. The present study uses the Generational Transmissions in Finland data collected in 2012 (n=601 women) and analyses whether childless younger women invest more in their kin than younger women with children. The study finds that childless women are more likely than mothers to invest in their nieces and nephews but not their aunts and uncles. Thus the results are in line with the reproductive value prediction.

Cover; Half title; Series Page; Title Page; Copyright Pgae; Table of Contents; List of Figure; List of Tables; List of Boxes; Foreword; Preface; Chapter 1: Cooperative breeding species; Grandparents: More important than ever?; The problem of intradisciplinarity; The aim of the book; A reader's guide to Intergenerational family relations; References; Chapter 2: Theories on intergenerational relations; Evolutionary theories on intergenerational relations; Social science theories on intergenerational relations; Differences and similarities; Conclusions; References

This book offers a synthesis of social science and evolutionary approaches to the study of intergenerational relations, using biological, psychological and sociological factors to develop a single framework for understanding why kin help one another across generations. With attention to both biological family relations as well as in-law and step-relations, it provides an overview of existing studies centred on intergenerational relations – particularly grandparenting – that incorporate social science and evolutionary family theories. This evolutionary social science approach to intergenerational family relations goes well beyond the traditional nature versus nurture distinction. As such, it will appeal to scholars across a range of disciplines with interests in relations of kinship, the lifecourse and the sociology of the family.

AbstractEvolutionary theory posits that grandmothers can increase their inclusive fitness by investing time and resources in their grandchildren. According on the X-linked grandmother hypothesis, the asymmetric inheritance of X-chromosomes should be responsible for the biased effect of the investment by maternal and paternal grandmothers towards granddaughters and grandsons. The British Millennium Cohort Study (n=4445 children) was used to investigate the association between grandmaternal childcare and children's injuries between the ages of 9 months and 3 years. Support was found for the X-linked grandmother hypothesis predicting that the investment of paternal grandmothers benefits more granddaughters than grandsons, the investment of paternal grandmothers benefits granddaughters more than the investment of maternal grandmothers, and the investment of maternal grandmothers is similarly associated with the injuries of granddaughters and grandsons. However, no support was found for the prediction that maternal grandmothers benefit more grandsons than paternal grandmothers. Thus, some, although not univocal, evidence for the prediction that X-chromosomal relatedness shapes the grandmaternal effect on child outcomes was found.

AbstractThere is a lack of studies analyzing the association between grandparental investment and grandparents' happiness. Using nationally representative data from the Generational Transmissions in Finland project (sample n = 2,152 older adults), this study explores (a) whether grandparenthood is associated with self‐evaluated happiness, (b) whether there is an association between grandparental investment (measured by contact frequencies with grandchildren) and a grandparent's self‐perceived happiness, and (c) whether differences in the associations between grandparental investment and happiness vary according to the gender and lineage of a grandparent. Our results show that just being a grandparent is not associated with self‐evaluated happiness among older Finns. However, a positive association was found in the case of maternal grandmothers' investment and happiness.

PurposeThe purpose of this paper is to investigate public opinions towards elderly care. The authors analysed respondents' opinions towards financial support, practical help and care for elderly people.Design/methodology/approachThe authors used nationally representative data collected in Finland in 2012. Respondents represent an older generation (born between 1945 and 1950,n=1,959) and their adult children (born between 1962 and 1993,n=1,652).FindingsFirst, the authors compared the opinions of older and younger Finns but did not find that older adults were more likely than younger adults support the state responsibility, or vice versa. It was also when only actual parent-child dyads (n=779) from same families were included. Next, the authors found that several socioeconomic and family-related variables were associated with public opinions of elderly care in both generations. For instance, in both generations lower-income individuals supported the state's responsibility more compared to their better-off counterparts.Originality/valueThe study provides important knowledge on attitudes towards elderly care using unique two-generational data of younger and older adults.

SummarySibling relations are by nature ambivalent with high levels of both altruistic helping and competition. Higher relatedness is often assumed to reduce the occurrence of conflicts between siblings, but evidence of this has been scarce and mixed. Siblings typically compete over resources and parental attention, and parental constellations vary with sibship types. Since full-siblings compete over the same two biological parents, while half-siblings have only one shared biological parent and often a higher number of parents overall, it is hypothesized that conflicts are more common between full- than half-siblings. This study tested this assumption using the British Millennium Cohort Study (n=7527 children at age 11). Conflicts were measured as children's reports of how much siblings picked on and hurt each other. Households with full-siblings only, maternal half-siblings only, and both full- and maternal half-siblings were compared. The results show that children who were living with only their full-siblings were more likely to experience sibling conflicts compared with children living with their maternal half-siblings only. This was the case also after controlling for several potentially confounding variables. The results suggest that differential access to parental resources of available biological and step-parents may explain the higher amount of sibling conflict between full- compared with maternal half-siblings.