Even "breadwinner" wives do more housework than husbands

Almost half of women in opposite-sex marriages earn as much as or more than their husbands, a share that's tripled since the early 1970s. Yet even women who out-earn their male spouses undertake more unpaid labor such as childcare and housework, according to a new study from the Pew Research Center. 

About 16% of wives are the breadwinners in their families, while another 29% earn roughly the same amount as their husbands, according to the analysis, which is based on several sources of data including the U.S. Census Bureau and the American Time Use Survey. That means a combined 45% of women earn the same or more than their male spouses, almost triple the share that did so in 1972, Pew said.