Nothing was being withheld from him. It looks like he experienced a cytokine storm. The disease can trigger a massive immune response. When that happens your body is flooded with immune cells and their debris, which can lead to organ failure. The resulting organ failure is what kills you.
All had major health problems.
Two were a couple that took care of grandkids, who went everywhere.
The third took care of a great grandchild who also was in/out of the home.
Sickly people taking care of other's children is not the best decision.
Had a talk again with my Mom about not touching the great grandkids.