Purpose Many disabled people require support workers to complete personal care, daily tasks and participate in life roles. Due to the intimate nature of community disability support in domestic environments, understanding what facilitates positive relationships is paramount. We examined the intricate interplay of context and mechanisms that drive positive relationship outcomes for disabled people, their family members and support workers. Methods A realist-informed, participatory methodology involving three participant groups: disabled people, family members, and disability support workers. Results Sixteen participants participated in two workshops per group (5 disabled people, 5 family members, and 6 disability support workers). All three participant groups prioritised three key generative mechanism processes involved in positive relationship outcomes: (1) having clear communication, (2) building trust, and (3) developing a sense of flow. We describe how each mechanism manifested in a unique way for each group, and also how the activation of each mechanism was influenced by a dynamic resources/tensions balance specific to each group. Conclusion We describe the interaction between three mechanism processes involved in triadic relationships between disabled people, family members, and support workers. Attention is now required to explore strategies to negotiate the resource/tension balance particular to each group.