I know that under 21's cannot buy alcohol in the US. But is it OK for an adult to give them a drink if they buy it. My DD will be 19 and although she doesn't drink much she does enjoy the odd glass of wine with a special meal. I know that in some countries the age for adults to give alcohol to teens is diff than the age they can buy it for themselves, what is the possition in the US, as I do not want to do anything wrong.