The the universal implement of two-child policy is an important measure for China to promote long-term and balanced population development and maintain sustained and healthy economic growth in the new era.However, this social change presents both opportunities and challenges to the majority of young parents of the "only child generation".A large number of first-born children with the arrival of a second child suffer from anxiety, depression and even suicide by self-injury, which has aroused high social concern.How to deal with the problem of sibling relationship of the two-child family is not only a required course for modern families in China, but also a new challenge that the country and society have to face.As an important background for adolescent development in multi-child families, sibling relationship is not only a key topic in family upbringing, but also found to be closely related to adolescent mental health.Sibling age spacing is one of the most important factors affecting sibling relationship, and a large sibling age spacing is one of the major characteristics of the two-child families in China.It is not known how sibling age spacing affects sibling relationship among adolescent in China.The purpose of this study is to explore the effects of sibling age spacing on sibling relationship, and to explore the moderating effects of parental and adolescent psychological flexibility on sibling age spacing and sibling relationship,so as to provide evidence and support for the design of sibling intervention programs and provide guidance and suggestions for the one-child family to implement the two-child birth plan. It is expected to create more opportunities for China's "two-child families" to integrate into society and develop healthfully.Specifically through the following three studies:Study I:Validity and reliability of the Chinese version of Sibling Relationship Questionnaire. The students and their parents from grade 4 to grade 11 in five primary and middle schools in Jilin were surveyed by convenient sampling. .A total of 946 primary and middle school students from two-child families participated in the survey, 703 valid questionnaires were received, and 1115 parents from two-child families, 964 valid questionnaires were received.Through reliability and validity test, SRQ-Revised (Child) and SRQ-Revised (Parent) with 36 items and 3 factors (Warmth/Closeness, Conflict and Rivalry) structure were obtained.Study II: The effect of sibling age spacing on sibling relationship. A total of 392 parent-child samples were matched from Study I. The results showed that there was a moderate correlation between parents' and children's SRQ scores, children's warmth/intimacy scores were significantly higher than parents', and parents' conflict factor scores were significantly higher than children's. Sibling age spacing can significantly negative predictors of sib warmth/closeness and conflict.Study III: The moderating effect of psychological flexibility on sibling age spacing and sibling relationship.The sample is the same as Study II. SRQ-Revised (Child) and SRQ-Revised (Parent), self-made demographic variable questionnaire, Parental Psychological Flexibility Questionnaire (PPFQ), and Avoidance and Fusion Questionnaire for Youth (AFQ-Y8) were tested for two-child families. The results showed that adolescent psychological flexibility and parental psychological flexibility can predict warmth/intimacy, conflict and conflict and rivalry. Adolescent psychological flexibility and parenting flexibility have no significant interaction with sibling age spacing for the three sibling factors. For sibling quarrel and sibling confrontation, adolescent psychological flexibility and parenting psychological flexibility had significant interaction with sibling age spacing, respectively.All the evidence above suggests that, the Chinese version of SRQ-Revised (Child) and SRQ-Revised (Parent) can be used for the study of the sibling relationship among adolescents in the context of Chinese culture. Parents are more likely to overestimate sibling conflict and underestimate sibling warmth/closeness. Small sibling age spacing is a risk factor for sibling conflict. Adolescent psychological flexibility can buffer the negative impact of sibling age spacing on quarrel and confrontation. Parental psychological flexibility can buffer the negative effect of sibling age spacing on antagonism.
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