As far as I know, the family income is counted heavily than assets.
Each year, only 5% of parents' asset are supposed to be used to pay tuition. So if you have an asset of 200,000, only 10K of it is supposed to be included in EFC.
Unless you have 1 mil asset outside your primary residence and retirement account, with 90K AGI, you should be able to get some financial aid if your kids can get into a top tier school. The top tier schools are more generous on financial aid, while many other schools do consider equity in primary residence.
You can google the formula on the web.