Do birds of a feather leave the nest together? The role of sibling personality similarity in the transition to adulthood.

Empirical evidences on intragenerational transmission of life course have been demonstrated and that interpersonal similarity may moderate the effect. In particular, siblings who are more similar in their demographic characteristics are more likely to follow each other's life course transitions. Focusing on parental home-leaving and building upon the social influence processes and similarity-attraction effects, this study investigates whether the association between siblings' departures from the parental home increases when they are similar in the Big Five personality traits, like similarity in demographic traits. We use 28 waves of a longitudinal sample from "Understanding Society: The U.K. Household Longitudinal Study". The results of the multilevel discrete-time event-history analysis (N = 3,717 children) indicate that the association between leaving of a sibling and oneself was strengthened when they had a similar level of extraversion, particularly when they were both introverts. This implies that although introverted adolescents and emerging adults might take less initiative regarding social relationships and be more hesitant in their transition to adulthood, when a similarly introverted sibling makes such a transition, they are more inclined to do so. To conclude, the study uncovers the relationship between siblings' personality similarity and their resemblance in nest-leaving, which helps explain young adults' home-leaving decision in an era when delayed leaving is observed.

Nest leaver or home stayer? Sibling influence on parental home leaving in the United Kingdom.

Studies have suggested that the timing of leaving one's parental home can be influenced by a number of factors, such as gender, educational background, and parental characteristics. However, despite empirical evidence showing that siblings may influence one another's life course decisions, intragenerational effects on leaving home have not been adequately studied. In this study, we investigated the extent to which an event of a sibling leaving is associated with one's decision to leave the parental home and how demographic sibling characteristics may impact on the association. We also tested whether the number of siblings who left the parental home first is related to one's timing of leaving. Using data from "Understanding Society: The U.K. Household Longitudinal Study", we studied the process of leaving the parental home among 22,719 children and their siblings. The results indicated a positive relationship between leaving of a sibling and the own event of leaving. When siblings are brothers and have a small age gap, and when the nest-leaving sibling is older than the at-risk children, this relationship is even stronger. Finally, the more nest-leaving siblings one has, the less likely one is to stay at home. The findings provide evidence for cross-sibling effects on parental home leaving, underscoring the role of intragenerational associations with respect to life course events.