The authors look at how family income depends on family structure. Using data from the 1973, 1979, and 1987, Current Population Survey, the authors examines four income sources (earnings, property, child support, and government transfers) among seven family types for all families and for Latino, black, and white householder families. The authors find large income differences among families-primarily due to differences in earnings-but little change within family types over time. Increasing the work hours of adult members or relying on income support from nonresident family members is unlikely to substantially remedy the differences in income among family types, and specifically to improve the very low income of single-mother families. Other family policies are suggested.