There are studies that have estimated in dollar figures the effect on the economy of home work generally, a great portion of which is care work for relatives experiencing health problems. I could send you a dozen references, in which you could find dozens more, that put exact dollar figures on it.
Conservative estimates have put it anywhere between ten and—there are some wild estimates—as much as half of the GDP, you could almost put. Now, that's all of home work, half of which I would argue is care work. If you work with the numbers, you can find that this is an enormous amount of value in which we don't train, we don't support, and we obviously don't pay.