ABSTRACT Parents of autistic children involved in the Relationship Development Intervention (RDI) receive support and guidance in developing the parent-child relationship and play the key role in successfully delivering this therapeutic intervention. Despite there being emerging evidence that supports RDI’s effectiveness at improving child outcomes, little is known about the parental experiences of this intervention. This study aimed to explore parents’ experiences of RDI and its perceived outcomes for their autistic child and the family. Semi-structured individual interviews were conducted with 12 participants, and the data was thematically analysed, using an inductive approach. The analysis generated three themes: 1) It empowers the parents; 2) Gradual transformation of family life; and 3) Changes in children and family. Parents reported that RDI was time consuming but supported them to meet their children’s needs, having positive impacts on parent-child relationships. This is one of the first studies that explored the parental experiences of RDI, despite it being a parent-focussed intervention. The findings add to the growing evidence to support the efficacy of RDI. While RDI is in its early stage of building evidence, it may be a promising alternative approach for families of autistic children.