Also going back to the original question - Unless it has changed in the past two years, CSS profile schools will only reduce your EFC (that they calculate) by 40% when a second child start school.
If you have two children at CSS profile schools that use similar methodologies, that would mean you would be expected to pay 120% of your EFC. I’ve seen somewhere that the reduction for three children in school is actually worse, and that with three CSS profile schools, you might be expected to pay 135$ of your EFC.
It was a cause of huge concern for us when my oldest was looking at schools.