What's somewhat interesting is that at both very low and very high income levels, the % of stay-at-home parent is higher. So for people near poverty, or people making top 1%-ish income, it's less than a 2:1 ratio, more like 35-40%. For middle income like $40k-$100k, it's more like 3:1 or 4:1.
At no income level is it lower than 20% stay at home parent though, so not too much of an outlier in any case.
57% have both parents working full time
28% have one parent working full time and the other not working at all.
The remaining 16% is one full time, one part time.
As another commenter pointed out - while not the majority, it's definitely not an outlier.
[1] https://www.bls.gov/opub/mlr/2020/article/comparing-characte...