You should contact your local department of social services, and pursue getting Medicaid for them (as well as SNAP and TANF). U4U beneficiaries are almost always eligible for these (although it may take sustained efforts on your part to break through layers of people who don't know or don't go outside their mental box). There is no reason it can't be resolved quickly and favorably.
If Medicaid (for some reason that I can't imagine) is denied, you can then pursue coverage through the health insurance Marketplace (AKA Obamacare). https://www.healthcare.gov/get-coverage/
