I mainly mention this because I was terrified of starting Humira when I got diagnosed with AS years ago—those black box warnings are legit scary. But I had to weigh the risk of maybe developing a rare side effect versus the guarantee of my spine permanently fusing and my immune system burning everything else to the ground out of spite, and ultimately went for the Humira. And I'm glad I did, because my quality of life has improved massively.
Which is all to say that I hope your sibling's doing okay and found a treatment that works for them. It's scary out here, but there's hope, I promise.