Involving and supporting the family members and caregivers of people with mental illness is essential to high-quality mental health services. However, literature suggests that there is a lack of engagement between family members and mental health nurses (MHNs). Lack of knowledge among MHNs is often cited as one of the main reasons for this lack of engagement. The aim of this review was to explore the knowledge, skills and attitudes that are required by MHNs to enable to them to work more effectively with families affected by mental illness.