The headline on this WSJ article -- Why Rich Parents Don't Matter -- is at odds with the reporting. 

The longer version of the head that shows up in the browser tab -- How Poverty Hurts Young Children, and Why Rich Parents Don't Matter -- is somewhat more accurate, although it still understates the reported value of "rich" parents.

From the article:

These results capture the stunning developmental inequalities that set in almost immediately, so that even the mental ability of 2-year-olds can be profoundly affected by the socio-economic status of their parents. As a result, their genetic potential is held back.