Abstract
OBJECTIVES: Past research used equity theory and social comparison theory to explain the direct effect of maternal differential treatment (MDT) on psychological well-being. However, this focus on psychological pathways ignores possible social pathways, such as indirect effects of MDT on well-being through disrupting other family relationships. This study uses stress proliferation theory to argue that MDT, as a primary stressor in mother-child relationships, can produce secondary stressors in other family relationships (e.g., sibling tension and marital tension), which in turn leads to lower psychological well-being. METHODS: To investigate this mechanism, we conducted multilevel mediation analysis using data collected from 720 adult children nested within 308 families, as part of the Within-Family Differences Study. RESULTS: We found that sibling tension mediates the association between adult children's perceptions of maternal disfavoritism and their psychological well-being-a process we call the stress proliferation of maternal disfavoritism. In contrast, adult children's perceptions of maternal favoritism cannot trigger this stress proliferation process of producing marital tension nor sibling tension. DISCUSSION: The evaluation of the stress proliferation process of maternal favoritism and disfavoritism can help us to understand the difference in effects across various dimensions of MDT. This study contributes to the literature on social relationships as social determinants of health by investigating how intergenerational relationships are connected to other family relationships to affect family members' health.