Hey, Mark, i didn't see the part about your brother being sick. That's not good. I hope you're not the one who has to supervise him through this, that would take a lot out of you.
About 10 years ago my doctor told me I had Hodgkin's Lymphoma and sent me to a cancer specialist. That guy operated to take a big lump out of my neck, but after they got done looking at that they found it wasn't cancer at all, it was a bartonella infection... AKA "catscratch fever". I wish it were that simple for your brother but it sounds like he's a more certain case than I was. I hope the treatment goes well for him.