Preparing a living will is a great start. But even more important than the document is the discussion. What do they really want at the end of their life. The more you know the better you will feel if you have to make those decisions for them. A clear understanding leads to confidence at a difficult time. Make sure to talk about this issue despite how much you (or they) might not want to.
This is such an important issue. Don’t wait. Talk about it now. You will so much feel better knowing you did.
I hope this helps.
All the best.