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Something else to consider - if your nephew has a drinkng problem, he might have had a few private drinks before he went out to dinner with you. I did this all the time, because I didn't want people to notice me ordering too much so I drank in advance.
Once again, everyone's metabolism is different. Have you confronted him directly? I realize he may not tell you the truth, but it's worth a try.
It is a addiction and like all addictions from heroin through to alcohol people will always try and get theyre release from it in the easiest and quickest ways as well as the cheapest ways. Like LoisMary has said there is no one type every alcoholic can fall into but in a lot of cases especially with males weak drinks such as beers, ciders and alcopops etc really wont do a lot to a long term alcoholic because theyre body will be more than used to metabolising those concentrations.
Spirit drinking is the sign and it is the one indicator of a true and very much damaged alcoholic. Its quicker in its effect thereby giving you a faster release, it is also a more ''ecconomical'' way of getting utterly smashed because cost wise in comparison with beers and weak drinks it will do a lot more to you.
You need to find out his patterns this is very important, i know it may not seem it but the kinds of beverages he drinks can tell you a lot about how long hes been in this situation and even which direction hes heading in.