When court ordered child support ends, what do most people do after if the kids don't want to go to college?

Two kids are turning 18 and drop off child support next summer. It doesn’t look like they want to follow through with their original plans of going to college and the military.

Is offering to pay some amount for the two older kids be wise so their mother can at least feed them? We’ve got health insurance covered and have no issues helping with expenses like vocational schools or training. We’ve planned to buy them a car to share but that kind of hinges on what the kids agree to do to warrant a car and expense on us of paying their insurance.

We’re looking for ideas so their mother isn’t suddenly burdened, suggestions of things to try so the kids will become less expectant of us. We don’t want to make the kids feel abandoned but rather to get them into a mindset they must take some action rather than “chilling”.