How can we help a sick alcoholic who won't go to the Dr. or hospital?

My fiance’s brother has been an alcoholic for the last 20+ yrs and now he’s having medical problems more and more every day. He’s in his 40’s, still lives at home, no job. He won’t go see a doctor, his feet and legs are swollen to his knees, he can barely walk, he comments to his parents that his body is shutting down and pretty soon they won’t have to worry about him anymore. How can any family member or friend step in to try and get him to a hospital? Would an intervention help and how would we go about it? He drinks mostly beer and in one or two hrs he can slam almost 30 cans, go to sleep for a few hrs, get up and drink again.