Professional caregivers are fully aware of the major role family caregivers play in providing patient care. Consideration of their needs, especially psychological and social, must go along with the implementation of specific supportive actions, which remain generally inadequate. Based on a review of the literature, we offer several suggestions for better understanding what governs the involvement of family caregivers and how in-depth knowledge of their interactions enables improved support. Rallying family caregivers implies first acknowledging their existence and their specific roles as soon as disease is diagnosed; it's not only about support, but also integrating them according to their skills, their specific relationships with the patient and their respective desires. The aim is to consider the patient-caregiver dyad straightaway by validating caregiver needs (especially communication and informational) as well as their potential as treatment resources. The recognition of the role of family and close friends in providing patient care cannot take place without giving thought to the new interactions, which make it possible to adapt, beforehand, long-term patient management and the training of those involved.