No one does because everyone needs to have a job to survive in the US today. It used to be that many couples could survive on a single income. Not only did that allow them to better care for their kids, it also allowed them to help their siblings, parents, other family members, friends, neighbors, and community.

> It used to be that many couples could survive on a single income

Historically, this is not true - women have always taken in work. Living on someone else's dime was for the wealthy only. The post-war years were a historical anomaly.