According to WHO data, Indonesia's exclusive breastfeeding coverage in 2022 was recorded at only 67.96%, down from 69.7% in 2021, indicating the need for more intensive support so that this coverage can increase. While a mother is breastfeeding, in order to achieve exclusive breastfeeding, the mother needs support, one of which is family support. Family support plays a very important role in the smooth process of breastfeeding and breastfeeding. The aim of the research was to determine the relationship between family support and exclusive breastfeeding in RW 3 and 4, Kedung Asem Village, Wonoasih District, Probolinggo City. The research design used a correlation study with a cross sectional approach. The research subjects were breastfeeding mothers who had babies aged 6-24 months. The sampling technique was simple random sampling with a total of 50 respondents. The research instrument was a questionnaire and data analysis used the chi square test. Based on research results, 18 mothers' families supported and provided exclusive breastfeeding. Based on the output results table, the value of Asymp. Sig (2-sided) in the person chi square test is 0.001. Due to the value of Adymp. Sig (2-sided) 0.001 <0.005, so based on the decision above, it can be concluded that Ho is rejected and Ha is accepted. There is a significant relationship between family support and exclusive breastfeeding based on the significance value of person chi square which is smaller than 0.05. Family support is related to the success of providing exclusive breastfeeding to babies, this is supported by family knowledge about good breastfeeding. Breastfeeding mothers need to increase their self-confidence and motivation in providing breast milk, increasing knowledge about correct breastfeeding through counseling in health care settings.