Government policy and organizational factors influence family-focused practice (FFP) in adult mental health services. However, how these aspects shape psychiatric nurses' practice with parents who have mental illness, their dependent children, and families is less well understood. Drawing on the findings of a qualitative study, this article explores the way in which Irish policy and organizational factors might influence psychiatric nurses' FFP, and whether (and how) FFP might be further promoted. A purposive sample of 14 psychiatric nurses from eight mental health services completed semi-structured interviews. The analysis was inductive and presented as thematic networks. Both groups described how policies and organizational culture enabled and/or hindered FFP, with differences between community and acute participants seen. This study indicates a need for policies and organizational supports, including child and family skills training, to promote a whole family approach in adult mental health services.