My uncle suffers from alcoholism. His drinking has resulted in mental and physical health problems.
That is too bad, have you tried to get him to quit?
No, I'm not that close to him. It's not good to drink a lot of alcohol as it can affect the brain, liver, pancreas, and immune system.
I only drink during special occasions.
That's not so bad. As long as you don't drink large amounts over a long time period, have difficulty cutting down, or your usage doesn't lead to social/health problems, you're not an alcoholic. 
Yes, I rarely drink more than one. The only exception is New Years Eve.
That's a good time to drink. A time that isn't good to drink is during pregnancy, as that can cause damage to the baby.
I am a man, so I can't get pregnant. But that makes total sense.
Then that's one thing you don't have to worry about lol. Alcoholism used to be divided into two types: alcohol abuse and alcohol dependence.