Most people do not realize that the number of airline pilots now flying with heart conditions that would have washed them out forever previously is now through the roof. And the replacements for the ones who are a complete mess are very young and have very little experience. I live on a residential “airpark” with a bunch of airline pilots and it is a topic of discussion very frequently.
https://www.youtube.com/watch?v=ELkhBFMD4xE
https://www.youtube.com/watch?v=DQx5AMWWWws
Until the vaxes this type of thing was almost unheard of but now it happens far more frequently than what we even hear about.
I loosely follow American Freedom Flyers & the interviews Josh Yoder does, so I know a lot of pilots are flying with ‘known’ issues & some aren’t telling, but chest discomfort/pain, etc.
I quit flying years ago. If I were still flying, I would not be flying now between the pilots & their post-jab health issues plus the air controller diversity hire issues.
I sincerely hope your brother will be ok.