Very sorry to hear this. Prayers are with him and your family.
I know the z-pack and chloroquine (or however it’s spelled) is not a confirmed “cure”, but if he’s on his last leg (god forbid) it couldn’t hurt to have a family member ask to have him put on the combo. If it was for me I’d ask for myself immediately.
Best of luck to your relatives. Hope it works out. Going to be a tough few weeks coming up for all of us, but especially for those who are fighting for their lives, and those trying to save them.
Gilead's drug remdesivir has multiple clinical trials going around the country. Check with his physician to see if it is available and whether he may be a candidate.