It's Whooping Cough!!
It's unsettling how that seems to be making a comeback recently.
Thanks for all the calming thoughts. It seems to have worked! Things are much calmer there, but unfortunately that was after he booted his sister out of the house.
I told her he owes her one hell of a Christmas gift. And, thankfully, she's got a good sense of humor about it. While my sister, without a doubt, panicked and couldn't be reasoned with. B.i.l. without a doubt dug in his heels and made things worse. I agree with you Dotsie! If he'd just gone back in things would have gone differently. Anyway, high emotions there led to some really bad interactions and I'm very grateful that things have calmed down. Even more grateful to know for sure that b.i.l. will be just fine!