Additional Study Information: The Families At-Risk for Interstitial Lung Disease (FAR-ILD) study is designed to detect and study the earliest stages of ILD in adults with a family history of ILD. FAR-ILD is a non-interventional study. This means that FAR-ILD is not involved in testing any new interventions or therapies. The purpose of FAR-ILD is to gather data on family members of patients with pulmonary fibrosis over a long period of time in order to help physicians and investigators better understand interstitial lung disease. There is no cost associated with participating in FAR-ILD and your insurance will not be billed. All study procedures are paid for in full by the National Institutes of Health. If you enroll in the FAR-ILD study, you may be asked to undergo the following study-related procedures: CAT scan, pulmonary function testing, blood draw from a vein, bronchoscopy, & return visits.