This study presents the cultural adaptation of the Mentalization-Based Treatment (MBT) Lighthouse Parenting Programme for child maltreatment prevention in Chile. The original program, developed in the UK, was systematically modified to align with the Chilean context, incorporating stakeholder recommendations and expert panel consultations. This process entailed adapting intervention materials, addressing community distrust, motivating interveners, adjusting module names for varying literacy levels, and tackling high-precarity material challenges. The study involved semi-structured interviews with ten stakeholders and a survey distributed to a 20-member expert panel. Thematic analysis identified key themes for cultural relevance and effectiveness, leading to modifications using the Ecological Validity Model. The adapted program aims to enhance parents' understanding of their and their children's emotions, fostering a secure parent-child relationship. The study's findings have broader implications for psychosocial interventions globally, emphasizing the importance of cultural sensitivity and adaptability.