Finances are important for every family. Since you said “premed”, finances are even more important. However, tight things might be now and for the next four years, if you get to medical school finances are going to get even tighter.
Do you have other options that would be less expensive? If so, what are they and what would they cost?
There are a lot of universities that are very good for premed students. If you got accepted to Cornell and Caltech, then you are a very strong student and seem likely to have other more affordable options.