If you had no income you still get a check?
I believe that the check is $1,200 per adult or your tax liability, whichever is smaller. But the minimum is $600 per adult. So even someone who doesn't work will still get a check, but it will be $600, so long as they are not a dependent of someone else. (If they are, that person will get $500 for them.)
I'm not sure if the children's check get smaller based on income.