Family
Family consists of those closest to a person in terms of knowledge,  care, and affection, and may include biological family, family through marriage,  or family of choice and friends. The person with the progressive, life-limiting  illness defines their family and who will be involved in their care. 
Caregiver
A caregiver is an unpaid person who provides care and  support in a nonprofessional capacity, such as a family member, a friend, or  anyone else identified by the person with a progressive, life-limiting illness.  Other terms commonly used to describe this role include care partner, informal  caregiver, family caregiver, carer, or primary caregiver. 
Caregiver assessment
A caregiver assessment includes an examination of physical,  psychological, social, spiritual, linguistic, cultural, and environmental  considerations. The assessment may relate to the caregiver’s needs and  preferences, as well as associated treatment, care, and support. Use of  validated tools may help clinicians explore the caregiver’s values and  preferences, well-being, burden, skills and abilities, and resources.