That women can't be a breadwinner and have children. These days, it's normal for mothers to work full-time outside the house, even when their husbands have full-time jobs. Plus, there are a lot of single mothers with full-time jobs.
There are also women who have a full-time job, kids and a husband who doesn't have a job. (Because of the economy, not because they're lazy. Although there is some of that, too.) There's also such a thing as a stay-at-home dad. (One's right across the street from me.)
BTW, marrying a man just because he has a steady income is not a good idea. It happens, yeah, but I can't see Sandy going that route.