I am living with one now and he was okay doing everything on his own until lately, now he needs help with everything. He isn't on Medicaid. It's getting harder for me to maintain my job and take care of him. I'm losing money from missing work, but there's no one willing to take care of him.
Would he be able to pay you like an employee, including money for your social security? Does he have insurance that would pay you? If not, it may be better to keep your job and look for other options for your friend. It may be that a daycare program would be enough. If not, you may want to look at facilities to provide the care needed. Good luck!