Hi.
I feel for You. Before I was fortunate enough to purchase Scott Pro-Flow mask I had terrible headaches every time I painted anything. I have had a beard almost all my adult life so ordinary masks just don't cut it

.
I never got the buzz people seems to refer to, I seemed to skip that part and jump straight into the hang-over. And A BAD one at that.
Sorry to hear about Your brother in-law, it's never easy to understand the ways people behave.
Regards
Sam