There is a lack of family-based psychosocial support interventions in palliative care when a parent of children or youths has a life-threatening illness. One intervention that has shown positive effects is the family talk intervention (FTI). This study aimed to describe the influence of contextual factors on FTI sustainability, as perceived by healthcare professionals (HCPs), after a median of 18 months of implementation in clinical practice in cancer and palliative care when a parent of children or youths has a life-threatening illness.

Focus groups and individual interviews were conducted with 15 HCPs working with FTI. Data were analyzed using conventional qualitative content analysis.

HCPs identified contextual factors that facilitated or hindered the use of FTI. The analysis resulted in 3 categories, Trying to prioritize FTI and coordinate families in a complex context is challenging, Working alone without FTI-educated colleagues hampers sustainability, the satisfaction of seeing families become stronger contributes to a receptiveness for change.

This study shows that organizational support and resources, alongside the individual’s facilitating factors, such as receptiveness for change, are crucial for sustainability after the initial implementation. Witnessing a positive impact is motivational and also supports the sustainability of an intervention despite contextual constraints.