The aspects presented in this study reflect the way in which social workers from a public institution (Hunedoara County) and foster families from the same county, relate, the activities carried out jointly, the difficulties encountered in the collaboration between them and the opinions regarding the improvement of the collaboration between the social workers and the foster families. The study used a descriptive research design, based on the individual interview method, conducted among six social workers and 11 foster mothers. The data collection was carried out face-to-face and in online format, applying the research tool the semi-structured interview guide, between March and May 2023, after expressing the agreement to participate in the study. The results highlight that in the view of the participants, open communication, understanding, moral support, mutual respect, willingness to intervene and empathy are key factors in the effectiveness of the interaction between social workers and foster mothers with beneficial results for children with placement as special protection measures. Quarterly monitoring through home visits is the main activity carried out jointly by social workers and foster mothers. During the collaboration between the social worker and the foster family, certain difficulties may arise, such as not accepting the other's opinion in relation to aspects related to the care and education of children, lack of seriousness, ignoring phone calls or non-compliance with duties and obligations in relation to the job description. The implementation of joint courses, giving importance to the wishes of the foster family and psycho-social counselling are aspects that help to improve the collaboration between the social worker and the foster family.