The aim of the current study was to explore the contributions of both boundary dissolution (i.e. guilt-psychological control, blurring boundaries, parentification, and triangulation) as experienced in childhood, and trust in the romantic partner to young mothers' parental caregiving representations. The findings, based on a sample of 80 young Israeli first-time mothers, indicated negative correlations between types of dissolution and their representations. Trust in the romantic partner made a distinct contribution to the formation of mothers' representations above and beyond mothers' boundary dissolution. These results are suggestive of the important role of young mothers' relational history with their own mothers as well as their relationship with their romantic partner in shaping their parenting representations.