OP here. We've weathered the visit without too much trouble. My in laws, as I suspected, were sort of tone deaf about my wife's condition ("she's looks great! Even lost the baby weight!" says my mother in law). They also thought if they talked loudly and more slowly my wife would suddenly be able to speak more clearly. That weird commercial kept going into my head.
https://www.youtube.com/watch?v=Aq_1l316ow8
Anyway, the visit ended and my father in law (who rarely talks) pulled me aside and basically said he couldn't bear the thought of losing his daughter. So, he just didn't basically. He went into complete denial. He was apologetic, but the sense I got wasn't sorry for choosing self preservation over facing difficult realities. Which is kind of nice? I haven't heard from my brother in laws or their wives. The brothers have texted my wife, but the conversations have been fairly surface level. No one likes talking about difficult things in that family. That's my big take away. Lesson learned.
We are sort of in this strange new normal. Speech therapist. Occupational therapist. Keeping the chaos to a minimum since my wife is sensitive to loud sounds and lights (our evening nanny has been amazing on this front. Me, less so.). Things keep improving on a weekly basis.
In the meantime, we just continue on. I run a large division so all of that work that was waiting for me is being dug through. I spend a lot of time alone with the kids out and about. I didn't realize it how much I was alone until someone at the kids' tumbling class quietly asked where my wife was since I was obviously married and always alone with the kids. Basically in a Panera I sort of laid everything out, the stroke and the recovery and how crazy it's been to see the life we lived sort of taken up and flipped upside down. I went on about missing California and not having close friends here beyond co-workers we've only known for a few months, which makes it weird to go through this profound mess of an experience with (even though in my tiredness, I didn't mind unloading on a complete stranger).
Long story short, we made a friend! The mom invited my wife and I over for a quiet dinner and we actually hit it off with her and her wife. We've had the kids over for play dates and are slowly building that kind of friendship we had spent a decade cultivating in Santa Cruz. So, even in the midst of a shit storm, there's kindness there. You just have to be open to it.