Purpose: The development of medicine prolongs the time that patients stay in an intensive care unit (ICU). This study explores the experiences of family members of adult patients in an ICU. Methods: Data were collected through intentional sampling and in-depth interviews in quality research. From July 2015 to September 2015, 11 family members were interviewed in a teaching hospital in the south region. The interview process was recorded. The verbatim drafts were coded and analyzed with thematic content analysis. Results: Three themes were identified, namely, "full of uncertainty in life," "the need to know the information on the patients' condition," and "the need to ensure the quality of care." Conclusion: When a patient is admitted to an ICU, his or her family's life is full of uncertainty. The family has the need to obtain information about the patient's condition and ensure the quality of family care. This study found that the factors contributing to the uncertainty of the family members can be used as guidelines for nurses to understand family experiences and help meet their needs.