Associations between perceptions about siblings' development and emerging adults' adulthood attainment

Siblings shape each other's attitudes and behaviors during childhood and adolescence; however, it is less clear if siblings continue to influence each other in emerging adulthood. This study investigated the extent to which emerging adults modeled their siblings in domains of adulthood attainment. Participants included 1,750 emerging adults from the United States between the ages of 18 and 29 years. Data were collected via Amazon Mechanical Turk. Findings showed that perceptions of siblings' adulthood attainment were positively related to emerging adults' development in those same domains. Moreover, the extent to which emerging adults modeled their siblings enhanced these associations; neither birth order nor gender composition moderated these findings. In short, processes of sibling influence continue to be relevant in emerging adulthood.