Jealousy is a social emotion that has received little attention by developmental researchers. The current study examined sibling jealousy and its relations to child and family characteristics in 60 families with a 16-month-old toddler and an older preschool-age sibling. Sibling jealousy was elicited in social triads consisting of a parent (mother or father) and the two siblings. Positive marita...

BACKGROUND High levels of stress and depression are seen in both general practitioners (GPs) and hospital doctors, and this has implications for patient care. It is therefore important to discover the individual and organizational causes of elevated symptoms so they can be tackled. AIM To discover the relative importance of individual characteristics measured 10 years earlier compared with cu...

The studies of differences in life history and suitability of both water temperatures and trophic levels among rotifer sibling species improve our understanding of speciation, sibling species coexistence and possible niche differentiation over space and time, and consequences for the functioning of ecosystems induced by climate change and eutrophication. We collected Brachionus calyciflorus fro...

Two prominent explanations have been offered to explain the development of enduring rivalry. The evolutionary model stipulates that enduring rivalries are largely indistinguishable from lesser competitions at their outset and develop over time, taking on more distinctive conflict patterns as the adversaries recognize their long-term competition and react accordingly. In contrast, the punctuated...

Being an identical twin does not necessarily mean having identical perceptions of family functioning, nor of the twin relationship. Using the co-twin control design, the aim of this study was to explore perceptions of family dynamics and the twin relationship in monozygotic (MZ) twins discordant and concordant for Developmental Coordination Disorder (DCD). It was hypothesized that, as has been ...

The contribution of younger male and female siblings' conflict and involvement in deviant activities with their older brothers to younger siblings' adolescent adjustment problems was examined in the context of parenting. Ineffective parenting during younger siblings' childhood had no direct effects on adjustment but facilitated their exposure to older brothers' deviant peers and activities. The...

Guided by research and theory on sibling similarities and differences, this study explored the nature and correlates of two processes of sibling influence-social learning and sibling differentiation-during adolescence. Participants included two adolescent-aged siblings (M = 16.29 years for older siblings and M = 12.59 years for younger siblings, respectively) from 166 two-parent African America...