Book examines nannies and the mothers who hired them in suburbs west of Boston

In the mid-1990s and early 2000s, Cameron MacDonald spent a lot of time combing the playgrounds of neighborhoods from Brookline to Weston to Sudbury. A sociology professor at the University of Wisconsin, MacDonald was looking for nannies, and the typically high-earning mothers for whom they worked. Not surprisingly, she found them in droves.