When children have been separated from their families, interventions offered by child welfare services (CWS) to reunite the family arouse strong emotions in both the children and parents. Managing this reunification process and placing the child at the centre of this process place high demands on child welfare practitioners (CWPs). In trying to rebuild children’s relationships with their families, CWPs need to collaborate with the families and other professionals. Research, policy and concrete practical strategies are required to facilitate coordination of the efforts of the various municipalities as well as the other welfare services involved. Furthermore, researchers and policymakers are expected to inform their work and service improvement by drawing upon the experiences of children, families and professionals engaged in family reunification efforts, using a co-production approach. Co-production is proposed as a key strategy for accomplishing change and involving the child. There are several definitions of what constitutes co-production, and it is not without its challenges as there can be risks and negative consequences of co-production among participants. In this chapter, we explore co-production in the context of reunification strategies in CWS in Norway and Sweden. The focus on Norway and Sweden is based on the authors’ knowledge of the welfare systems in those two countries and provides a contextual framework to discuss possibilities and challenges in co-production in reunification services. The chapter is limited to children and their birth parents in Norway and Sweden; as such it does not cover unaccompanied children (refugees) with birth parents in other countries. We differentiate between involvement and co-production, as to be involved is to be consulted, whereas to co-produce is to be an equal partner and co-creator. Co-production requires management support and a clear strategy in addition to clear roles, mandates, and responsibilities, but also equal power and value of all participants’ knowledge in the co-production process. This can be especially true in vulnerable and complex situations, such as in reunification processes with child protective services. In this chapter, we discuss organisational possibilities in co-production in CWS, especially focusing on CWPs’ possibilities and challenges in co-production. Having CWPs as co-producers with families and children and young people alongside the requirements of co-production may be seen as impossible to achieve completely in CWS, but there are options to co-produce parts of the reunification process. The discussion is based on current research, policy, a and experience from practice.