Earlier quoted context omitted.
Good news: you're almost certainly wrong :) Obamacare in MN is through https://www.mnsure.org/ . Your father being fired or laid off qualifies as a special enrollment event. If your mother is seriously ill, look at gold plans and simply look at the maximum out of pocket. Find a plan with a maximum out of pocket of $2k or even $1k pp. They'll spend it all, and after that, your out of pocket expenses will be limited to…
At $1,000/month that's over 10% of his pre-tax income at his current job. That's a lot of money if you aren't working and your income goes to zero.
People with big enough health problems that the heavily subsidized Silver market category is insufficient, but who have only a middle class income, do get stung in this system; But before Obamacare they would have been treated much, much worse should their employer fail to provide them with good health insurance. The Silver market plans are supposed to represent the standard level of care, and be subsidized on a sliding scale from 99% right above the Medicaid threshold, down to 0% at ~$100k income or so, IIRC.