@SteelJustice - Sit down with your parents, and run the Net Price Calculator at that university’s website. This should give you numbers similar to the aid package you received. If the results are quite different from your aid package, you can talk the numbers through with the financial aid office.
I know it is hard for you to think about turning down this particular university. But you need to do that thinking. No college or university in the country is worth taking on the level of debt you are asking your family to consider. They have just sold a house at a loss, and the business that is keeping your family afloat is shaky. A gap year to find better options for yourself could be your best plan.