Related Experiment Video
Updated: Jul 12, 2025

Use of a Video Scoring Anchor for Rapid Serial Assessment of Social Communication in Toddlers
Published on: March 14, 2018
Sibling effects on problem and prosocial behavior in childhood: Patterns of intrafamilial "contagion" by birth order
Zhaotian Chi1,2, Lars-Erik Malmberg2, Eirini Flouri3
1MRC Cognition and Brain Sciences Unit, University of Cambridge, Cambridge, UK.
Abstract:
We investigated longitudinal relations between siblings' problem and prosocial behavior, measured by the Strengths and Difficulties Questionnaire, among different sibship sizes in the UK's Millennium Cohort Study. We identified 3436 families with two children and 1188 families with three children. All children (cohort members and their older sibling [OS]) had valid data on behavior at two time points (in 2004 and 2006). Using structural equation model, we found that for internalizing and externalizing problems, OSs (MOS1 = 6.3 years, MOS2 = 9.1 years at T1) exerted a dominant effect on younger siblings (Mage = 3.12 years at T1; 49.7% boys) across sibship sizes. For prosocial behavior, there was OS dominance in two-child families and youngest sibling dominance in three-child families.
More Related Videos
Related Concept Videos
Behavioral Genetics and Its Designs
The primary methodologies used in behavior genetics include family studies, twin studies, and adoption studies, each providing unique...
Inclusive Fitness
Relationship Formation
Adler's Individual Psychology
Bullying
Conduct Disorder

