Did he get early treatment?
Was he denied in-patient treatment for CoupFlu until his O2 level dropped?
BTW, going by pulse oximetry in diabetic patients with the Coof to determine oxygenation is notoriously unreliable.
His providers had to be aware of that.
Note to his family: get a lawyer.
His providers are likely immunized six ways from Sunday for what they prescribed for the Coof.
Try a different tack.