Driven by demographic structural changes and an upgrade in quality consumption, the parent-child tourism market is transitioning from extensive supply to refined services. Child-friendly facilities are key carriers for enhancing the parent-child tourism experience, with their demands showing significant differentiation across various family structures. Existing research often treats “families” as homogeneous entities, overlooking the demand variations arising from differences in family structures. This study takes Chongqing, a mountain city, as a case study, focusing on four types of families: those with multiple children, intergenerational combinations, single-parent families, and dual-income core families. It employs a mixed-methods approach to reveal the differentiated patterns of demand for child-friendly facilities, identifying four core issues such as supply-demand mismatch and inadequate terrain adaptation. Based on these findings, optimization paths are proposed from four dimensions, including facility layout and service design, providing practical guidance for the high-quality development of parent-child tourism in Chongqing and similar mountainous cities.