“…A growing body of literature has documented that siblings influence and shape each other in the course of childhood, adolescence, emerging adulthood, and later life (Cicirelli, 1995;Updegraff et al, 2002). Studies showed that throughout these stages, siblings can influence one another with respect to various life course events, such as first sexual encounter, leaving the parental home, fertility, union formation, and partnership dissolution de Vuijst et al, 2017;Haurin & Mott, 1990;Holdsworth, 2000;Lyngstad & Prskawetz, 2010). Because sibling ties typically last the longest and involve a sense of family belonging, compared with most other family ties, individuals are able to witness and relate to their siblings' life courses longer (Cicirelli, 1991;Connidis, 1992).…”