Need some serious opinions please!!

Hello everyone! I'm new here, so I'd really appreciate any and all advice. Here's the situation:
About a yr & a half ago, I befriended this older gentleman, kinda took him under my wing to help him with his current medical issues. Anyhow, to get to the point, this gentleman I'll call "Joe", he's 73yrs old, lived alone all his life, never married, no children, parents died some time ago, and he's got 1 older brother aged 78. Mind you this older brother has not seen or visited Joe for atleast 12yrs, he calls Joe occasionally but that's it! Recently the older brother found out about me helping Joe, I feel he's a bit jealous that Joe is not relying on his "older brother knows best" advice anymore. But recently the older brother has been basically forcing Joe to go to the Mayo clinic for treatment, mind you, Joe lives in NY. This past year Joe has had bladder issues, enlarged prostate, and as of recently, numbness in his legs/feet, which the neurologists said was neuropathy problems. Well for some reason the older brother keeps telling Joe the reason he's sick is because he has bedbugs & he's going to die if he doesn't go to the Mayo clinic. Can anyone tell me in their experiences or research, do bedbugs have any relation to causing health problems to humans? Right now, Joe is a pack of nerves & hates to defy his older brother. So I figured if I could get some input on the situation then I'd relay the info to poor Joe & maybe put his mind at ease once and for all! Any advice/opinions welcomed. Thank you!