Palliative and hospice care aims to improve quality of life of patients' relatives, but still little is known about their specific problems and needs. We present a comprehensive literature update. Narrative review to present an expert overview of peer-reviewed, English-written original research publications and reviews on psychosocial and existential problems, supportive needs as well as interventions for relatives during the patients' disease trajectory published between January 2017 and November 2018. A total of 64 publications were included. Relatives report high rates of psychological and existential distress, burden and psychological morbidity during the total disease trajectory of the patient. In addition, relatives report an alarmingly high number of unmet needs with information being the central issue. Relatives' problems and needs are part of complex systems influenced by various socio-demographic factors and patient⁻relatives-interactions and dependency between different psychological phenomena. First support interventions for relatives during disease trajectory have proven feasible and secondary data from randomized studies suggest beneficial effects of providing early palliative care also for relatives. Relatives should be addressed to a still larger extent in the daily practice of palliative and hospice care, thus further research to reveal more detailed systematic information is needed to improve relatives' psychological burden and quality of life.