The role of mating effort and co-residence history in step-grandparental investment

: Pettay Jenni E., Coall David A., Danielsbacka Mirkka, Tanskanen Antti O.

Publisher: Cambridge University Press

: Cambridge

: 2024

: Evolutionary Human Sciences

: Evolutionary human sciences

: Evol Hum Sci

: e27

: 6

: 2513-843X

DOI: https://doi.org/10.1017/ehs.2024.17

: https://doi.org/10.1017/ehs.2024.17

: https://research.utu.fi/converis/portal/detail/Publication/404739678

The prevalence of divorce in both parental and grandparental generations has led to a rise in the number of children who now have families that include both biological and step-grandparents. Despite the thorough examination of biological grandparents' contributions in the recent literature, there remains a scarcity of studies focusing on the investment of step-grandparents. Using population-based data from a sample of 2494 parents in Germany, we assessed grandparental investment through financial support and assistance with childcare of grandparents (N = 4238) and step-grandparents (N = 486). The study revealed that step-grandparents provided lower levels of investment in their grandchildren compared with biological grandparents. Furthermore, the study identified that a longer duration of co-residence between step-grandparents and parents earlier in life did not correspond to an increase or decrease in step-grandparental investment. However, investment by separated biological grandparents increased with the increasing length of co-residence with parents. In line with the scarce literature on step-grandparental investment, these findings indicate that mating effort may be the most important motivation for step-grandparental investment.

the-role-of-mating-effort-and-co-residence-history-in-step-grandparental-investment.pdf