Being uninsured affects one's ability to access medical services and maintain health. Using longitudinal data from the Survey of Income and Program Participation, the authors investigated how individual and family insurance coverage affects adult health. They found that health insurance coverage often varies across family members and changes frequently. Employing multivariate analyses that control for personal insurance status, predisposing characteristics, and enabling resources, the authors show that adults who are members of families that include other uninsured members are more likely to report poor health than adults in full-coverage families. Policy makers should consider refocusing public and private insurance coverage goals to include full-family coverage. (Contains 4 tables, 1 figure and 2 notes.)