This is measuring household income, not individual income. Real household income isn't increasing because wages are rising, it's increasing because more people in a household are working.

On the other hand, household sizes have decreased.

(Though not sure about workers per household.)

> [...] it's increasing because more people in a household are working.

More people are working outside the house and participating in the market economy. Women worked before, domestic chores don't show up in these statistics.

Presumably they produce a lot more working outside the house: to estimate a monetary value of what they did before compare with the prevailing wages for nannies and housekeepers.