Consistent with inclusive fitness theory, evolutionary biologists predict that individuals care more for their biological than their social children and hence that biological children assess the relationships to their parents better than stepchildren. To test this assumption, we use data from...

Intergenerational relationships within family and kinship have become a salient issue in scientific research. Major reasons were intense demographic changes in the 20th century, such as the increased life expectancy in combination with decreased fertility, and its implications for major...