I am very new to all this myself, & I am coming in from the wife/caretaker angle.....so if I am out of line, let me know & please please don't take it personally. I hate that you are having to deal with this. I saw where you said...
Whenever she's home he cancels dialysis to be with her. She doesn't communicate when he's sick so we are always in the dark and always feel like we have to call and check in on him.
I don't mean to pry, but how often is she NOT around & why? Does she FULLY understand the need for dialysis? I'm sure that he does, but does she really understand that he could die with out it? I have been reading (& probably WAY too much these days) as much as I can to fully understand what the worst case senarios are....I know that if Charles (hubby) wants something or doesn't want to go to dialysis I have a really hard time telling him "no" because I just want him to be happy, but I have to tell myself that if I cave in & let him have his way, it could hospitalize him or even kill him. If my hubby was to have adverse reactions, or (God forbid) die as a result of something I did or didn't do...I don't think I could live with myself.
I honestly hope that she truely loves him enough to want to learn more about his medical problems & want to help him. I wish the best for you & I hope that you can get through to the both of them.