does his mother know about his condition? does his brother with prostate cancer stage 4 know about your hub’s condition? if not, i would make sure they did and i would have the entire fam on his back about it. what is he going to do? yell at you, not talk to you? i think you can handle that if it means he gets treated and stays alive.
I agree with this advice. The more you have yelling at him, the better.