How old is your future son-in-law? How long as he been working? If he had a job but is losing the job because he is too ill to work, might he be eligible for social security disability and with it medicaid? Will he get unemployment? If he is single and has no income, would he qualify for medicaid?
I know that in this state, even if you are not married, your bf/gf's income is counted when considering eligibility, if you live together- not that fraud isn't common on that technicality.