Substance-use problems affect not just the residents in the treatment facility but the whole family system. The present study considered the family members of the residents in treatment and rehabilitation as the respondents of the study. Specifically, the study looked into the family functioning, personality type, and codependency. Codependency was measured in terms of self-sacrifice, reactivity, and external focus. Problem-solving skills, goal setting, and communication skills were used as measures of family functioning. Moreover, personality type was measured in terms of openness to experience, conscientiousness, extraversion, agreeableness, and neuroticism. There were 302 respondents in the study from different public and private treatment and rehabilitation facilities in Luzon, Visayas, and Mindanao. The result shows that problem-solving skills predict self-sacrifice with 13.6% of variance accounted for. In addition, higher level of neuroticism predicts low level of reactivity or willingness to solve their family problems and that goal setting predicts external focus. The study implies that one's perceived ability to solve family problems increases the likelihood to be selfless in handling family problems. Furthermore, worry and anxiety decreases the willingness to help family members but the goal of making their family members happy contributes to their desire to respond and prioritize their family's needs. The study strengthens and affirms the collectivistic culture and strong family ties of Filipinos.