I am so sorry to hear about all these issues your parents have to deal with on top of dealing with cancer. My heart goes out to you!
I don't have any specific recommendations to solve this problem. BUT - I can make a few suggestions:
1) Call the American Cancer Society at the phone number listed at the bottom of this page. It is their help hotline and I am sure they can tell you what options exist.
2) You can look into fundraising sources such as www.gofundme.com or www.giveforward.com.
3) We recently posted a blog about dealing with the costs of cancer. Here is the link: http://blog.whatnext.com/blog/peer-perspectives/9-tips-for-dealing-with-the-financials-of-cancer
Please let me know if you still need help in finding other options. I'll be happy to help any way I can. And please keep us posted. We care.