BackgroundCancer patients who are parents show concerns about their ability to parent following diagnosis, and their adolescent and young adult (AYA) children have a need for improved cancer communication within the family. However, psychosocial support for families affected by parental cancer is not routinely available. This study explores the implementation of the Parent Support Worker (PSW) role, as part of a new cross sector model of care to support parent patients, their partners, and AYA children.MethodsTwo PSWs, social workers and healthcare staff (n = 26) from three hospitals participated in audio-recorded, semi-structured interviews about implementation of the PSW role. Template Analysis and Normalization Process Theory were used to analyze the interviews. Data on PSW service activity and referrals of AYA to support from a community organization were analyzed using descriptive statistics.ResultsEleven themes categorized into enablers and barriers of implementation were identified. Regarding acceptability of the role, three enablers (social workers’ understanding of the PSW role increasing, easy and prompt access of staff and parent patients to PSWs, satisfaction with the PSW role) and one barrier (communication related confusion and frustration about the PSW role) were identified. Additionally, three enablers (the PSW role fills gaps in parenting-focused support and continuity of care, the PSW role alleviates social workers’ workload, negotiation helped to define responsibilities) and one barrier (fear of social work roles to be overtaken by PSWs) for appropriateness of the role were found. Finally, two enablers of feasibility of the role (PSWs and social workers co-managing the work, higher confidence from hospital staff to talk about children in the family) and one barrier (lack of systematic identification and referral processes) were identified. Across hospitals, the number of referrals of AYA children to the community organization increased between 2.7 and 12 times nine months post-introduction of the service.ConclusionsEstablished in response to identified gaps in oncology care for parents with cancer, their partners and AYA children, a novel cross-sector model of care was acceptable, appropriate, and feasible. Barriers and enablers to implementation identified in this study need to be considered when designing and implementing similar services.Supplementary InformationThe online version contains supplementary material available at 10.1186/s12913-023-09413-8.