The dual journey: The development of twins’ relationships throughout childhood

Hila Segal*, Ariel Knafo-Noam

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

Twin bonds, likely the most enduring of human relationships, provide both solace and rivalry for twins. Using an evolutionary psychology perspective, this chapter scrutinizes twins’ bonds from prenatal stages to childhood to better understand their unique relationships. Twins’ interactions, which begin in the womb, establish patterns of cooperation and competition. The initial years pose parenting challenges that shape the twins’ experiences of dependency and rivalry. As twins grow, five dimensions—closeness, dependence, conflict, rivalry, and dominance—emerge, evolving distinctly between monozygotic twins (MZ: sharing close to 100% of their genes) and dizygotic twins (DZ: sharing on average 50% of their genetic variance). The chapter notes the closer relationship MZ twins share compared to DZ twins. While the closeness and dependence among DZ twins decline throughout childhood, these elements remain stable in MZ twins. The effect of zygosity on conflict and rivalry is less clear. For both MZ and DZ twins, conflict stays steady, while rivalry intensifies with school entry, probably driven by external comparisons, but lessens as twins develop into late childhood. Unlike singletons, where birth order dictates dominance dynamics, in twins, this dynamic is more variable and becomes more defined by around 6.5 years of age. Several factors are presented as impacting the nature of the twins’ relationships: the evolvement of ‘twin language’, the parenting style and the differential parenting they receive. This exploration into the development of twins’ relationships underlines the importance of tailored caregiving and invites further research into the genetic and environmental factors that shape close bonds.

Original languageEnglish
Title of host publicationAdvances in Child Development and Behavior
EditorsJeffrey J. Lockman
PublisherAcademic Press Inc.
Pages273-298
Number of pages26
ISBN (Print)9780443294242
DOIs
StatePublished - Jan 2024

Publication series

NameAdvances in Child Development and Behavior
Volume67
ISSN (Print)0065-2407

Bibliographical note

Publisher Copyright:
© 2024

Keywords

  • Childhood
  • Closeness
  • Conflict
  • Dependence
  • Dominance
  • Longitudinal Israeli Study of Twins (LIST)
  • Parenting
  • Rivalry
  • Twins’ relationship development
  • Zygosity

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