In the 1970s, the two-tiered family structure was closely correlated with race, but since that time it has become increasingly associated with parents’ social class more than race… College-educated blacks are looking more like college-educated whites, and less-educated whites are looking more like less-educated blacks…

In the 1970s, there were virtually no class differences in how much time a child got with mom or dad. By 2013, however, the average infant or toddler of college-educated parents was getting half again as much Goodnight Moon time every day as the average infant or toddler of high-school educated parents… Rich kids get more face time, while poor kids get more screen time.

—Robert Putnam, Our Kids
Quoted in Immobile in America