For sure. Now that dual income is expected to maintain the cost of living, no one is left to do housework and child care. Which means either outsourcing that to someone who makes less than your lowest earner, or taking time off to care for the kids and housework.

But honestly as an employer, I'd rather people take a few hours off to tend to their family's needs then stick around being unproductive and then having a stressful family life too. But most corporations don't think that way. Especially since the ones in charge are usually single income earners with staff to take care of the house.

I don't know. The majority of households that I'm familiar with have always been dual-income. Being able to live on a single income became something only the wealthy could afford (in my part of the US, anyway) decades ago.