Aim The aim of this grounded theory study was to explore mothers' perspectives of the processes of collaborative goal setting in multidisciplinary child development services involving follow‐up home therapy. Methods Semi‐structured interviews were conducted in South East Queensland, Australia with 14 mothers of children aged 3–6 years who were accessing multidisciplinary child development services. Interviews were focussed around the process of goal setting. Results A grounded theory of Maternal Roles in Goal Setting (The M‐RIGS Model) was developed from analysis of data. Mothers assumed Dependent, Active Participator and Collaborator roles when engaging with the therapist in goal‐setting processes. These roles were characterized by the mother's level of dependence on the therapist and insight into their child's needs and therapy processes. Goal Factors, Parent Factors and Therapist Factors influenced and added complexity to the goal‐setting process. Conclusion The M‐RIGS Model highlights that mothers take on a range of roles in the goal‐setting process. Although family‐centred practice encourages negotiation and collaborative goal setting, parents may not always be ready to take on highly collaborative roles. Better understanding of parent roles, goal‐setting processes and influencing factors will inform better engagement with families accessing multidisciplinary child development services.