One of the issues I personally have to deal with is the amount of myths and snake oils for the liver while the solutions are usually available locally.
Sorry to hear about your father-in-law. As far as reducing alcohol cravings, I would no put faith in that. The problem is that people who want to drink will, even if they are dying. I had to go to the edge to stop, but that's how hard it is.
One condition in Canada, and typical globally, for a transplant is abstinence for at least 6 months BEFORE they will even consider you for pre-transplant testing. The reason for this is that even people who have undergone a transplant will start drinking again. Theories abound - genetics, learned behaviours, whatever. Bottom line for me to stop drinking took more than a doctor saying I should. I had to be flat out in the hospital before I realized the bottle is definitely not my friend. Most of those I'd lost already..
A key difference between any other drug or alcohol and marijuana is that we have a naturally occurring system of CB receptors, so when we ingest marijuana it doesn't change us physically and that's why it's not physically addictive.
Marijuana will slow the onset of full-on cirrhosis, but to reverse it like I did requires completely no alcohol. In addition you need good food (organic, local), quality medical marijuana products (Charlotte's Web flowers, oils, etc) are great for stabilizing the blood enzymes, which reduce edema (swelling of feet and legs), puritis (itchy skin), and the main one - Jaundice. You will lose the yellow skin and eyes as the THC kills the fatty liver cells and the CBD stabilizes blood.
The brain issue, sometimes called "wet brain" is totally treatable with Lactulose (not lactose), an sweet orange liquid that cleans the ammonia from the brain. Don't use too much because its also a laxative. One tablespoon in the morning should be fine.
Be careful with oils and tinctures. Try to find a reputable maker because there are lots of amateurs out there.
I know this is too late for your father-in-law, but if you know someone dying of cirrhosis, this might help.