When Brian Peters and his 80-year-old mother both fell ill with Covid-19 last May, she seemed to face the greater risk.
Lilah Peters’s age and her diabetes were two factors that can amplify the disease. Mr. Peters, who lived with her in Sergeantsville, N.J., was three decades younger, slightly overweight but otherwise in good health, according to his girlfriend, Diana Robertson. Both mother and son were hospitalized at the same time, went on ventilators and died 11 days apart.
“To…