Tanskanen, Antti Olavi; Danielsbacka, Mirkka
University of Helsinki, Finland
Based on evolutionary kin selection theory individuals are predicted to have more contacts with full than half siblings, and more with nieces and nephews via full siblings than via half siblings. To study these hypotheses we use data from the Generational Transmissions in Finland project (n = 2,278 older adults between age 62 and 67 years). We found that older adults have more contacts with full than with half siblings, and more with nieces and nephews via full than half siblings. The results show support for the prediction based on the kin selection theory.