Well, I immediately thought of your poor sister trying to convince her husband he needs to flush out his liver. The poor dear. She has her hands full.
Most men react negatively to the thought of flushing their gallbladders. (That male macho thing!) That's why you guys who are regular flushers (and posters) hold a dear place in my heart!
If she can get him to read all the positive posts from people, that will help. Also, flushing your liver is something that will take less than 24 hours while surgery will involve a couple of weeks recovery time not to mention the cost of the hospital stay and surgery and Dr's expenses. He is also giving up an organ he really needs.
I will keep your family in my thoughts. Let us know what he decides!