Intergenerational relations between affinal kin create both support and tensions to family members. Previous studies indicate that relations with affines may change once a grandchild is involved, yet this has not been explored with respect to conflicts. We use survey data of contemporary Finns (n = 1202) to investigate how parenthood is associated with the likelihood of reporting conflicts with one’s own parents and parents-in-law. Based on inclusive fitness theory, we hypothesise that affinal kin will be treated more like biological kin if a couple has children as compared to childless couples. Results show that overall, Finns reported higher conflict occurrence with their own parents than with their in-laws. Compared to childless couples, parents were as likely to report conflicts with their own parents, but more likely to report conflicts with their parents-in-law. Results were robust after taking into account several sociodemographic factors as well as the contact frequencies and emotional closeness between the parties concerned. Daughters-in-law were more likely to report conflicts when paternal grandmothers provided more grandchild care, indicating that the conflict measure used here is indeed related to investment in offspring. We conclude that shared relatedness to a grandchild renders affines “more like kin” with regards to conflicts, indicating the existence of a “kinship penalty” in family relation in addition to the previously reported “kinship premium”.
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Allen, S. M., & Hawkins, A. J. (1999). Maternal gatekeeping: mothers’ beliefs and behaviors that inhibit greater father involvement in family work. Journal of Marriage and Family, 61, 199–212.
Anttonen, A. (1999). Child home care allowances: an innovation in Finnish family policy. Studies in social security and health no. 52. Helsinki, Finland: The Social Insurance Institution.
Apostolou, M. (2015). Interparental disagreement over in-law choice. Personal Relationships, 22, 285–298.
Burton-Chellew, M. N., & Dunbar, R. I. M. (2011). Are affines treated as biological kin? A test of Hughes’s hypothesis. Current Anthropology, 52, 741–746. doi:10.1086/661288.
Chan, K. L., Brownridge, D. A., Tiwari, A., Fong, D. Y. T., & Leung, W.-C. (2008). Understanding violence against Chinese women in Hong Kong: an analysis of risk factors with a special emphasis on the role of in-law conflict. Violence Against Women, 14, 1295–1312.
Chong, A., Gordon, A. E., & Don, B. P. (2017). Emotional support from parents and in-laws: the roles of gender and contact. Sex Roles, 76, 369–379. doi:10.1007/s11199-016-0587-0.
Clarke, E. J., Preston, M., Raksin, J., & Bengtson, V. L. (1999). Types of conflicts and tensions between older parents and adult children. The Gerontologist, 39, 261–270. doi:10.1093/geront/39.3.261.
Coall, D. A., & Hertwig, R. (2010). Grandparental investment: past, present, and future. Behavioral and Brain Sciences, 33, 1–59. doi:10.1017/S0140525X09991105.
Coall, D. A., & Hertwig, R. (2011). Grandparental investment: a relic of the past or a resource for the future? Current Directions in Psychological Science, 20, 93–98.
Curry, O., Roberts, S. G. B., & Dunbar, R. I. M. (2013). Altruism in social networks: evidence for a “kinship premium.”. British Journal of Psychology, 104, 283–295. doi:10.1111/j.2044-8295.2012.02119.x.
Daly, M., & Wilson, M. (1988). Homicide. Hawthorne, NY: Aldine de Gruyter.
Danielsbacka, M., & Tanskanen, A. O. (2012). Adolescent grandchildren’s perceptions of grandparents’ involvement in UK: an interpretation from life course and evolutionary theory perspective. European Journal of Ageing, 9, 329–341. doi:10.1007/s10433-012-0240-x.
Danielsbacka, M., Tanskanen, A. O., Hämäläinen, H., Pelkonen, I., Haavio-Mannila, E., Rotkirch, A., Karisto, A., & Roos, J. P. (2013). Sukupolvien vuorovaikutus. Auttaminen ja yhteydenpito suurten ikäluokkien ja heidän lastensa elämässä. In Inter-generational relations: helping and interaction in the life of Finnish baby boomers and their adult children. Helsinki: Finnish Family Federation.
Danielsbacka, M., Tanskanen, A. O., & Rotkirch, A. (2015). Impact of genetic relatedness and emotional closeness on intergenerational relations. Journal of Marriage and Family, 77, 889–907. doi:10.1111/jomf.12206.
Euler, H. A. (2011). Grandparents and extended kin. In C. A. Salmon & T. K. Shackelford (Eds.), The Oxford handbook of evolutionary family psychology (pp. 181–210). New York: Oxford University Press.
Euler, H. A., Hoier, S., & Rohde, P. A. (2001). Relationship-specific closeness of intergenerational family ties. Findings from evolutionary psychology and implications for models of cultural transmission. Journal of Cross-Cultural Psychology, 32, 147–158.
Fagan, J., & Barnett, M. (2003). The relationship between maternal gatekeeping paternal competence, mothers’ attitude about the father role, and father involvement. Journal of Family Issues, 24, 1020–1043.
Fischer, R. L. (1983). Mothers and mothers-in-law. Journal of Marriage and Family, 45, 187–192.
Fowler, C., & Rittenour, C. (2017). A life-span approach to children-in-law’s perceptions of parent-in-law communication. Journal of Family Communication. doi:10.1080/15267431.2017.1281280.
Griffin, A., & West, S. A. (2002). Kin selection: fact and fiction. Trends in Ecology & Evolution, 17, 15–21. doi:10.1016/S0169-5347(01)02355-2.
Hagestad, G. O. (2006). Transfers between grandparents and grandchildren: the importance of taking a three-generation perspective. Zeitschrift Familienforschung, 18, 315–332.
Hamilton, W. D. (1964). The genetical evolution of social behaviour (I and II). Journal of Theoretical Biology, 7, 1–52.
Hank, K., & Buber, I. (2009). Grandparents caring for their grandchildren: findings from the 2004 survey of health, ageing, and retirement in Europe. Journal of Family Issues, 30, 53–73.
Hogerbrugge, M. J. A., & Komter, A. E. (2012). Solidarity and ambivalence: comparing two perspectives on intergenerational relations using longitudinal panel data. The Journals of Gerontology, Series B: Psychological Sciences and Social Sciences, 67, 372–383. doi:10.1093/geronb/gbr157.
Hrdy, S. B. (1999). Mother nature. A history of mothers, infants, and natural selection. New York: Pantheon Books.
Hrdy, S. B. (2009). Mothers and others. The evolutionary origins of mutual understanding. Cambridge, MA: The Belknap Press of Harvard University Press.
Hughes, A. L. (1988). Evolution and human kinship. New York: Oxford University Press.
Igel, C., & Szydlik, M. (2011). Grandchild care and welfare state arrangements in Europe. Journal of European Social Policy, 21, 210–224. doi:10.1177/0958928711401766.
Jalovaara, M. (2012). Socio-economic resources and first-union formation in Finland, cohorts born 1969–81. Population Studies, 66(1), 69–85.
Kangas, O., & Kvist, J. (2013). Nordic welfare states. In B. Greve (Ed.), The Routledge handbook of the welfare state (pp. 148–160). London & New York: Routledge.
Korchmaros, J. D., & Kenny, D. A. (2001). Emotional closeness as a mediator of the effect of genetic relatedness on altruism. Psychological Science, 12, 262–265.
Kulu, H. (2014). Marriage duration and divorce: the seven-year itch or a lifelong itch? Demography, 51, 881–893.
Lahdenperä, M., Gillespie, D. O., Lummaa, V., & Russel, A. F. (2012). Severe intergenerational reproductive conflict and the evolution of menopause. Ecology Letters, 15, 1283–1290. doi:10.1111/j.1461-0248.2012.01851.x.
Leonetti, D. L., Nath, D. C., & Hehman, N. S. (2007). In-law conflict: women’s reproductive lives and the roles of their mothers and husbands among the matrilineal Khasi. Current Anthropology, 48, 861–890.
Linn, R., & Breslerman, S. (1996). Women in conflict: on the moral knowledge of daughters-in-law and mothers-in-law. Journal of Moral Education, 25, 291–307.
Liu, X. (2009). Ordinal regression analysis: fitting the proportional odds model using Stata, SAS and SPSS. Journal of Modern Applied Statistical Methods, 8, 632–645.
Lüscher, K. (2002). Intergenerational ambivalence: further steps in theory and research. Journal of Marriage and Family, 64, 585–593.
Lüscher, K., & Pillemer, K. (1998). Intergenerational ambivalence: a new approach to the study of parent-child relations in later life. Journal of Marriage and the Family, 60, 413–425.
Lyngstad, T. H., & Jalovaara, M. (2010). A review of the antecedents of union dissolution. Demographic Research, 23, 257–292.
Mace, R. (2013). Cooperation and conflict between women in the family. Evolutionary Anthropology: Issues, News, and Reviews, 22, 251–258.
Mitnick, D. M., Heyman, R. E., & Smith Slep, A. M. (2009). Changes in relationship satisfaction across the transition to parenthood: a meta-analysis. Journal of Family Psychology, 23, 848–852. doi:10.1037/a0017004.
Official Statistics of Finland (OSF) (2012). Families [e-publication].ISSN=1798–3231. Annual Review 2011. Helsinki: Statistics Finland [referred: 9.7.2015].Access method: http://www.stat.fi/til/perh/2011/02/perh_2011_02_2012-11-09_tie_001_en.html
Official Statistics of Finland (OSF). (2015). Perinatal statistics—parturients, deliveries and newborns. Helsinki: National Institute for Health and Welfare (THL) [referred: 29.6.2015].[e-publication]. Access method: http://www.stat.fi/til/sysyvasy/index_en.html.
Official Statistics of Finland (OSF). (2017). Educational structure of population. Helsinki: Statistics Finland [e-publication]. ISSN=2242-2919 [referred: 12.5.2017].
Pillemer, K., Suitor, J. J., Mock, S. E., Sabir, M., Pardo, T. B., & Sechrist, J. (2007). Capturing the complexity of intergenerational relations: exploring ambivalence within later-life families. Journal of Social Issues, 63, 775–791.
Robertson, J. F. (1975). Interaction in three generation families, parents as mediators: toward a theoretical perspective. International Journal of Aging & Human Development, 6, 103–110. doi:10.2190/GPFM-TFM5-9Y8Y-LHAK.
Rossi, A. S., & Rossi, P. H. (1990). Of human bonding: parent-child relations across the life course. New York: Aldine.
Rotkirch, A. (forthcoming). Evolutionary family sociology. In R. Hopcroft (Ed.), Oxford handbook of evolution, biology and society. Oxford: Oxford University Press.
Rotkirch, A., Lyons, M., David-Barrett, T., & Jokela, M. (2014). Gratitude for help among adult friends and siblings. Evolutionary Psychology, 12, 673–686.
Salmon, C., & Hehman, J. (2014). The evolutionary psychology of sibling conflict and siblicide. In T. K. Shackelford & R. D. Hansen (Eds.), The evolution of violence (pp. 137–157). Springer New York: New York, NY.
Salmon, C., & Hehman, J. (2015). Evolutionary perspectives on the nature of sibling conflict: the impact of sex, relatedness, and co-residence. Evolutionary Psychological Science, 1, 123–129.
Salmon, C., & Shackelford, T. K. (Eds.). (2011). The Oxford handbook of evolutionary family psychology. New York: Oxford University Press.
Sear, R., & Coall, D. (2011). How much does family matter? Cooperative breeding and the demographic transition. Population and Development Review, 37, 81–112. doi:10.1111/j.1728-4457.2011.00379.x.
Sear, R., & Mace, R. (2008). Who keeps children alive? A review of the effects of kin on child survival. Evolution and Human Behavior, 29, 1–18.
Strassmann, B. I., & Garrard, W. M. (2011). Alternatives to the grandmother hypothesis: a meta-analysis of the association between grandparental and grandchild survival in patrilineal populations. Human Nature, 22, 201–222.
Szydlik, M. (2016). Sharing lives: adult children and parents. Abingdon: Routledge.
Tanskanen, A. O., & Danielsbacka, M. (2014). Genetic relatedness predicts contact frequencies with siblings, nieces and nephews: results from the generational transmissions in Finland surveys. Personality and Individual Differences, 69, 5–11. doi:10.1016/j.paid.2014.04.034.
Tanskanen, A. O., Danielsbacka, M., & Rotkirch, A. (2014). Multi-partner fertility is associated with lower grandparental investment from in-laws in Finland. Advances in Life Course Research, 22, 41–48. doi:10.1016/j.alcr.2014.04.003.
Tanskanen, A. O., Danielsbacka, M., Jokela, M., David-Barret, T., & Rotkirch, A. (2016a). Diluted competition? Conflicts between full and half siblings in two adult generations. Frontiers in Sociology, 1. doi:10.3389/fsoc.2016.00006.
Tanskanen, A. O., Danielsbacka, M., Jokela, M., & Rotkirch, A. (2016b). Sibling conflicts in full- and half-sibling households in the UK. Journal of Biosocial Science, 48. doi:10.1017/S0021932016000043.
Thompson, L., & Walker, A. J. (1987). Mothers as mediators of intimacy between grandmothers and their young adult granddaughters. Family Relations, 36, 72–77.
Voland, E., & Beise, J. (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. In E. Voland, A. Chasiotis, & W. Schiefenhövel (Eds.), Grandmotherhood: the evolutionary significance of the second half of female life (pp. 239–255). New Brunswick: Rutgers University Press.
Waynforth, D. (2011). Grandparental investment and reproductive decisions in the longitudinal 1970 British cohort study. Proceedings of the Royal Society B: Biological Sciences, 279, 1155–1160. doi:10.1098/rspb.2011.1424.
Willson, A. E., Shuey, K. M., & Elder, G. H. (2003). Ambivalence in the relationship of adult children to aging parents and in-laws. Journal of Marriage and Family, 65, 1055–1072. doi:10.1111/j.1741-3737.2003.01055.x.
The data collection was funded by the Academy of Finland (Grant nr. 250620).
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On behalf of all authors, the corresponding author states that there is no conflict of interest.
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Danielsbacka, M., Tanskanen, A.O. & Rotkirch, A. The “Kinship Penalty”: Parenthood and In-Law Conflict in Contemporary Finland. Evolutionary Psychological Science 4, 71–82 (2018). https://doi.org/10.1007/s40806-017-0114-8
- Affinal kin
- Cross-generational relations
- Grandchild care