Research highlights the psychosocial impact of critical illness on family who typically adopt a caregiver role to the survivor. We review evidence on informal caregiver psychosocial outcomes and interventional studies designed to improve them. We argue informal caregivers have distinct and complex needs that differ from patients. Interventional studies ought to be designed for this cohort with careful attention paid to the timing of interventions. We consider the influence of social isolation on recovery and discuss service improvement approaches to build social support networks to enhance recovery, where caregivers and survivors are involved in the design of aftercare programs.