Lucy, he could be a functional alcoholic. Actually, with his diabetes, elevated BP and high cholesterol, he should not have been drinking at all. What the doctor said could be true--that the liver disease is a complication of the other health problems. Generally, though, it will be the kidneys that start to fail. However, cholesterol meds can harm the liver. While a patient is on them, they generally have to have liver function tests.
Good luck with your talk and let us know how it went.
Hugs,
Connie