Aim of the present study was to identify which families involved in child welfare are willing to organize a Family Group conference (FGc; phase 1) and which are most likely to complete a conference (phase 2). Data were used of a Dutch randomized controlled trial (N = 229). First, the proportion of families willing to organize an FGc and actually completing a conference was determined. Then, for each of the phases, reasons for dropout according to parents, child welfare workers and FGC-coordinators were assessed and categorized and family characteristics were linked to completion rate. Results showed that 60% of the families (137 families) were willing to organize an FGc and 27% (62 families) eventually completed a conference. Reasons for dropout were lack of motivation, high-conflict divorce situations and need for other professional care. Broken and/or newly formed families were less likely to complete a conference, whereas families with indications for child maltreatment were more likely to complete a conference. Future research is needed to examine other possible explanations for the relatively low success rate, such as attitude of child welfare workers towards FGC and the lack of understanding of the aim of FGC by child welfare workers and families.