I'm very sorry to hear this, and I can only hope things start to look up for your family.
Since I'm not American (which I'm presuming your family are from, since most users online are American. Please correct me if I'm wrong and apologies in advance!), Unfortunately, I don't come from a wealthy background so I get where you're coming from. Since my mum's a single mum and bought a house... In order to pay for personal luxuries and for my education, at one point, I was undertaking a diploma at a private college, trying to get a uni degree and working part time all at once.
A tertiary education is absolutely important, so I would strongly recommend against quitting unless you can use what you've learned so far for extra credit if and when you return. Alternatively, if deferring is an option, you can do so and use that time to work instead.
I can only come up with
extremely basic advice, I'm sorry to say (that you may have already considered):
* If this isn't already the case, your family should do their best for every member to be in the workforce. Even if it's just 10 hours a week working for the local tuckshop, the small cash injection can really help. You don't even have to use this income to contribute towards the family directly- you can just use this money for yourself to pay for your own necessities, which would save your parents having to do so.
* Speaking of part-time work, if you haven't done so already, try and research for local businesses that are "entry-level friendly", since from what I've understood, you haven't worked before. I'm talking snack bars, supermarkets, green grocers, bookstores, movie usherers, etc. You can use Google Maps or the phonebook to sift through places that seem interesting and apply for work. Not being able to drive can be a thorn in your side when looking for work, but if you live nearby the workplace, they won't care unless the job involves the need to drive.
* Not sure how American wage laws work, but under 21 workers are generally cheaper (in Australia, at least) and the silly season is approaching, so big franchises would love to hear from you, even if you have no experience. They tend to be more flexible with work hours. You can get on-the-job competency training, which can be used to get better part-time work later on.
* Are there any on-campus jobs at your college? Also, sometimes college bulletin boards advertise local jobs.
* Depending on how far you are in your degree, maybe you can get some entry-level jobs relating to your studies? That way you can build experience, contacts and an income.
* Have your parents consulted some banks, financial advisors, mortgage brokers, etc. for advice? Absolute best case scenario, it may be possible to find a mortgage plan that better suits their financial situation. They would have to be very careful and make sure they're getting a top-notch deal.
* I've already read that the bus service in your area is impractical, but if that's the case, how about using it only one way a day? I can't say how much your family will be able to save on fuel, but I'm sure it'd help even a bit since fuel is so damn expensive. Maybe you can catch the bus on the way home, so you don't have to worry about being late to your classes (unless you finish college really late at night, in which case it may not be safe to catch a bus).
* Some have suggested bike-riding, and this isn't bad. How about getting dropped off halfway and then going the rest of the way via bike? It'd save a bit, which still counts.
* I don't mean to sound insulting, but have you considered getting financial aid/social security/welfare payments for yourself? In Australia, most students qualify for what's called "Youth Allowance" unless your parents are quite wealthy. I don't know how it works in the US, or if there is an equivalent, but it's worth phoning the authorities responsible for financial aid and asking if you're entitled to anything. Even if they don't know or offer anything, they could refer you to a service that can help.
Sorry for the really basic advice. I hope your situation improves.
