Founded in family systems theory, the spillover hypothesis suggests that marital relationships are linked to parenting. The current study used meta-analysis to extend this literature and examine links between marital positivity and marital negativity with absolute levels of parental differential treatment (PDT) of siblings. Multilevel data included 2575 effect sizes nested within 45 sources (articles/raw datasets), nested within 12 unique samples. Lower marital positivity and greater marital negativity were linked to greater differences in treatment. Those main effects, however, were moderated by several source and effect size characteristics. For example, links were stronger when effect sizes were based on differential positive interactions. Caution is warranted in most cases; effect sizes were generally small. Findings, however, suggest that parents should be aware of how they may treat their children differently in connection with poorer marital relationships. Future research on PDT should include a greater focus on the domains of differential treatment.

中文翻译：

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婚姻关系溢出与兄弟姐妹的父母差别待遇：多层次荟萃分析

溢出假设建立在家庭系统理论中，表明婚姻关系与养育子女有关。目前的研究使用荟萃分析来扩展这些文献，并检查婚姻积极性和婚姻消极性与兄弟姐妹父母差别待遇 (PDT) 的绝对水平之间的联系。多级数据包括嵌套在 45 个来源（文章/原始数据集）中的 2575 个效果大小，嵌套在 12 个独特样本中。较低的婚姻积极性和较大的婚姻消极性与更大的治疗差异有关。然而，这些主要影响受到几个来源和影响大小特征的影响。例如，当效果大小基于不同的正相互作用时，联系会更强。大多数情况下需要谨慎；效应量一般较小。然而，调查结果，建议父母应该意识到，如果婚姻关系较差，他们可能会如何区别对待孩子。未来对 PDT 的研究应该更加关注差异化治疗领域。