This study investigated the relationship between parent–teacher collaboration and learners’ holistic development, addressing the problem of how collaborative practices between home and school contribute to academic performance, social skills, emotional well-being, behavioral adjustment, and motivation. Conducted at Sumagonsong Elementary School, the research employed a descriptive–correlational design to analyze data from respondents with diverse demographic profiles, including age, gender, educational attainment, and socioeconomic status. The design allowed the study to measure the strength and direction of relationships between collaboration dimensions and learner outcomes while considering demographic influences. Findings revealed that parent–teacher collaboration significantly predicts learners’ holistic development, with parental involvement emerging as the strongest contributor, followed by communication, teacher responsiveness, and shared decision-making, all of which positively influenced learner growth. Interaction alone was not statistically significant, suggesting that the quality and depth of collaboration are more critical than the frequency of contact. The demographic profile of respondents also shaped the nature and extent of collaboration, showing that background factors influence how parents and teachers engage in supporting learners, particularly in terms of communication styles, cultural expectations, and resource availability. Overall, the results affirm that parent–teacher collaboration is a cornerstone of holistic education and a vital strategy for fostering learners’ academic success, emotional resilience, social competence, and lifelong growth, while also highlighting the importance of demographic diversity in shaping collaborative practices.