Hospital social workers (HSW) play an important role in health care, providing psychosocial support to families affected by severe illness, and having palliative care needs involving dependent children. However, there are few evidence-based family interventions for HSWs to apply when supporting these families. The Family Talk intervention (FTI), a psychosocial family-based intervention, was therefore evaluated in an effectiveness-implementation study. Within the study, HSWs were educated and trained in the use of FTI in clinical practice. This study examined HSWs' experiences of barriers and facilitating factors during their initial use of FTI in clinical practice. Altogether, 10 semi-structured focus groups were held with HSWs (n = 38) employed in cancer care and specialized palliative home care for adults, pediatric hospital care, and a children's hospice. Data were analyzed using content analysis. HSWs considered FTI to be a suitable psychosocial intervention for families affected by severe illness with dependent children. However, the way in which the care was organized acted either as a barrier or facilitator to the use of FTI, such as the HSWs' integration in the team and their possibility to organize their own work. The HSWs' work environment also impacted the use of FTI, where time and support from managers was seen as a significant facilitating factor, but which varied between the healthcare contexts. In conclusion, HSWs believed that FTI was a suitable family intervention for families involving dependent children where one family member had a severe illness. For successful initial implementation, strategies should be multi-functional, targeting the care organization and the work environment.