My father is disabled receiving SSDI and has Medicare. He is now single, has subsidized housing however had a massive stroke. Any advice?

Our family has no money. I don't understand why he doesn't qualify for Medicaid as well or if anyone can help me in getting him Medicaid. I believe his SSDI benefits are $1200 and change. He has zero assets. No car. I'm on SSDI myself. He needs a caregiver and doesn't have the money for it but if he had Medicaid it would help him with alot of things. I dont know what to do. Can anyone give me advice? I need to add that he's always been told he makes too much but it doesn't seem right for only getting $1271 and then paying rent and a few bills.