[gumby]

>That norm [young family with one breadwinner] is quickly going out of style at least

Not convinced: "Among married-couple families with children, 96.8 percent had at least one employed parent, and 61.1 percent had both parents employed" -- https://www.bls.gov/opub/ted/2017/employment-in-families-wit...

[Balero]

So the norm for a young family is to have two breadwinners by your stated data.

[gumby]

It's above the majority, but "norm" seems like it implies a lot more, like at least 2 sigma....sorry if it sounds like I'm splitting hairs here.