Wow, so you married young. (Not judging one bit... personally, I don't have a huge problem with that, unless your FIL's 30
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
).
All we can do is pray for his recovery. He should be getting antivirals, things that boost his immune system (vitamins C, D & Zinc have been noted to do good things against Covid), Ivermectin, etc, etc.