“…In addition, some models, including attachment theory (Bowlby, 1969), social learning t h e o r y ( B a n d u r a , 1 9 77 ) , a n d e c os y s t e m t h eo r y (Bronfenbrenner, 1989), emphasized the role that sibling relations play in shaping children's development. There are many factors associated with the sibling relationships, which can be divided into two levels, individual level and familial level (e.g., the familial environment and the parent-child interaction) (Abramovitch, Pepler and Corter, 1982;Brody, Stoneman and MacKinnon, 1982;Chen et al, 2017, 2018, Chen, 2019Gicirelli, 1972;Cruz, Mechammil and Robins, 2019;Daniels and Plomin, 1985;Furman and Buhrmester, 1985;Gamble and Yu, 2014;Minnett, Vandeil and Santrock, 1983;Stoneman, Brody, Churchill and Winn, 1999;Volling, 1997Volling, , 2001Yin, Li, Li and Liu, 2019). In the present study, we pay more attention to the individual level factors associated to the sibling relationships.…”