Dude, I know I am some rando on the internet, but if your dad is getting bad ventilation is the worst thing they can do. It exacerbates the cytokine storm by flooding the body with oxygen. You can read about it here: https://www.zerohedge.com/covid-19/damn-you-hell-you-will-not-destroy-america-here-spartacus-covid-letter-thats-gone-viral

I hope they pull through.