The study investigated Family type and Family size as correlatesof parents/guardians disposition towards girl-child education amongst female students in public tertiary institutions in Delta state. Two research questions were raised, with their corresponding hypotheses formulated and tested at 0.05 alpha levels, the survey design using the descriptive survey and the correlational approach was adopted for the study. One dependent variable, parents/guardians disposition towards girl-child education and the independent variables of family type and family size were involved in the study. The population of this study consisted of ten thousand five hundred and thirty-six (10,536) female students from three (3) public tertiary institutions in Delta State. The sample size of the study consisted of 250 female students in tertiary institutions in Delta State. The multistage sampling technique was adopted for this study. The instrument used for the study was questionnaire titled "Family Types, Family size and Socioeconomic Status Questionnaire" (FTFTSSQ) adapted from Ofuani (2013). The questionnaire consists of three sections, A, B and C, with reliability coefficient of .88. The hypothesis was analysed using linear regression. The results indicated that Family type significantly predicts parents/guardians disposition towards girl-child education in tertiary institutions in Delta State. However, family size, does not significantly predict parents/guardians disposition towards girl-child education in tertiary institutions in Delta State.Based on these, recommendations were made.