Implied by "single income".

In reality in most families all family members were contributing something to the household income.

Income in this context means trading labor for cash.

In the past, huge amounts of household work were done without any such exchange.

Today, child raising, cleaning, cooking, provisioning, and more remain unpaid household labor. The people who do that work were not idle 800 years ago, and they are not idle today.

Women and kids would tend to animals and food came directly from the animals. They both would tend the fields when work did not required physical strength - and thre was plenty of such work too. The crafts women did were for sale or trade. They would also sell on the market whatever excess household produced.

If we are talking about "centuries" quite a lot of people including men did not worked as in being employed for salary. But their work was economical - necessarily so.

Being stay at home mom today is mostly battling boredom and demotivation. Or then, making up things to do. It is not the same as milking cows or making cheese.

> Being stay at home mom today is mostly battling boredom and demotivation. Or then, making up things to do. It is not the same as milking cows or making cheese.

I was a stay at home parent for my daughter. It was extremely far from battling boredom (except perhaps for first year and a half, if that, and even then anyone who is actually interested in child development will not find it boring) and it was the opposite of demotivating.

Rather than speak in such broad generalizations, I think it would be better to restrict your claims to specific, real stories.