Abstract This descriptive research was conducted to identify the level of parental involvement in school-related activities with parents’ family structure, educational attainment and sex. Specifically, the study sought to answer the following questions: (1) What is the extent of involvement of parents in participating in school-related activities as a whole and when grouped according to family structure, educational attainment, and sex? (2) Is there a significant difference between parents’ involvement in school related activities and their family structure, educational attainment, and sex? A researcher-made questionnaire checklist of 20 items which was categorized into three parts (Personal Information, Preliminary Data, and Questionnaire-Checklist) was the instrument used. Frequencies, mean, and standard deviation for descriptive analysis and Mann–Whitney U test and Kruskal–Wallis test for inferential analysis were used to generate, interpret, and analyze the difference between parental involvement in school-related activities. The results revealed that as an entire group, the parental involvement in school-related activities in a school in Iloilo City was “generally involved”. Moreover, when classified to categories, such as family structure and sex, the extent level of the respondents is “generally involved”. However, when respondents were classified as to highest educational attainment, parental involvement in school-related activities of parents with basic education and are college graduates was “generally involved” while parental involvement to post graduate parents’ was “highly involved”. This shows that even though parental involvement as a whole is “generally involved,” the extent level of parents differs when it comes to their highest educational attainment.