There’s a book called I’m Not Sick, I Don’t Need Help by Dr Xaviar Amador.
It’s intended to teach you ways to talk to your ill family member so that you can bring the stress levels down for everyone involved, and hopefully, get them to see that they could benefit in some way from treatment even if they can never see that they are sick.
It’s a short book, and easy enough to understand, but it takes a lot of practice to get right. However, a lot of people have great success with it.
There are also some videos and information on it here:
and here:
I sound like a broken record recommending this book so often, but it really helped me even though I still can’t follow the LEAP method it teaches 100%. I’m very direct & blunt so it goes against my nature, but I continue to try.