Well, historically, living on the breadline meant that bread was all you could afford in the way of food (I think).
Anyhow, move on to the 21stC, and I technically live below the breadline. And yet I manage rather well.
Having children can be very cathartic. I have finally realized that it isn't about what you earn ... it's about what you don't spend.
My son has toys, books, clothes, etc, but I am happy to go without stuff. I pay my bills on time, I don't have a credit card, and I owe nothing (apart from the mortgage, which is slightly different).
I suspect that many people who live way beyond the bread line are up to their necks in debt. In which case, I'm better off.