As used in this article, the following terms shall have the meanings indicated:
An alcoholic beverage as defined in the New Jersey Alcoholic Beverage Law, N.J.S.A. 33:1-1 et seq.
A person who has qualified as a guardian of the underaged person pursuant to testamentary or court appointment.
A person under the age of 21 years and includes the term "underaged person."
The underaged person's grandparent, aunt or uncle, sibling or any other person related by blood or affinity.