A primary caregiver is a person who has primary responsibility for someone who cannot fully care for themselves. This can be a family member, a trained professional, or other people. Depending on the culture, there can be multiple family members involved in Care. This concept can be important in relation to attachment theory as well as family law, for example in guardianship and child custody. Some states in the United States, such as California, have defined the responsibilities of the primary caregiver.