Abstract
Two well-supported generalizations from aggression research are that: a) people are less likely to commit homicide against close kin compared to non-kin, and b) females are less likely to engage in direct aggression than are males. Aggression between siblings, however, is somewhat more complicated than one might surmise from those two generalizations. Data from 3 studies collected using undergraduate and Prolific samples (N = 1640) reveal classic sex differences in direct aggression between non-relatives, but not between sisters and brothers. Whereas only a small minority of females have hit a friend or an acquaintance, the majority of females, like the majority of males, have hit a sibling. Although reputational aggression is substantially less likely between siblings than between friends or acquaintances, mild forms of direct aggression (such as hitting) are quite frequent between siblings. Discussion considers several possible limitations of the findings reported here and considers results in light of Trivers' theory of parent-offspring conflict.
Original language | English (US) |
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Pages (from-to) | 214-227 |
Number of pages | 14 |
Journal | Evolution and Human Behavior |
Volume | 45 |
Issue number | 2 |
DOIs | |
State | Published - Mar 2024 |
Keywords
- Familial aggression, sibling rivalry
- Reputational aggression
- Sex differences
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
- Experimental and Cognitive Psychology
- Arts and Humanities (miscellaneous)