He missed a lot during his senior year, varsity sports, prom, graduation ceremony, but he will have a story to tell. My 80+ father in law has a lot of stories that his father told him about Spanish Flu. He’s afraid to even leave his house. We are encouraging him to get outside.
Sun would be good for your FIL. Supplements too (ask about K2 for him). As you age, your ability to generate D3 from the sun decreases. Like all other good things...