You will not know if you don’t ask. And asking while they still have funds is helpful.
You will want to gather as much info as possible before a meeting or call. You may be starting with admissions about merit and get transferred to financial aid talking about any need based funding they have.
Do you have the full financial aid packages or just the merit offers? In the full financial aid packages you will see any need based grants, work study, loans, etc… if you do not have the full financial aid offers you need those to compare apples to apples.
Are there additional scholarship rounds to apply for?
Is the cost of attendance the same for all? Or does that vary? Ask for consideration of getting your family to a similar overall cost. That may be an additional $12000 instead of $20,000 depending on the cost of attendance.
What did the NPC show for each school? What is the gap in what you can actually afford? Are there any additional circumstances to share with the financial aid office?
Depending on the school, the decision making can take a few days or months.
Help your son identify what he likes about the school and help find similar things to be excited about at the other schools in case this is just not affordable.