The American family may be under stress, but most children still live in two-parent households, the Census Bureau reported Wednesday.

Over all, 7 in 10 children live with two parents, about two-thirds live with two married parents, and about 6 in 10 live with both biological parents, according to the latest analysis, which is drawn from 2004 surveys.

In 1970, 85 percent of children were living with two parents and 11 percent with their mother only, proportions that shifted to a little more than 70 percent and slightly more than 20 percent, respectively, in 1990.

The comparable figures in 2004 were about 70 percent and 23 percent. The figures suggest that the tumultuous shifts in family structure since the late 1960s have leveled off since 1990.