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Using secondary data from the National Longitudinal Survey of Youth 1979 Children and Young Adults, this study examines behavioral problems during childhood, risk behaviors during adolescence and early adulthood, and college completion rates among young adults who had a disabled sibling during childhood. Both boys and girls with a disabled sibling have higher reports of behavioral problems in childhood than those without a disabled sibling. Both boys and girls with a disabled sibling exhibit more externalizing behaviors than those without, particularly antisocial behaviors. Furthermore, girls with a disabled sibling also exhibit more anxiety, peer conflict, and headstrong behaviors than girls without a disabled sibling. These behavioral problems do not persist into adolescence, however, and young men and women with a disabled sibling see similar or lower rates of risk behaviors as those without a disabled sibling. Adultification appears to contribute to the lower likelihood of risk behaviors particularly in adolescence. Women are less likely to complete college if they had a sibling with a disability during childhood; there is no significant difference by sibling disability status for men. While family income and mother’s education do not attenuate the college completion gap between those with and without a disabled sibling, having stably married parents during childhood largely eliminates this gap.