Rick and Jane hosted a high school graduation party for their daughter, Amy. Alcohol was served at the party but Rick put a sign near the table with the alcohol that stated "Must be over 21 to indulge". Bill is an 18 year old graduate who keeps sipping from the alcoholic punch bowl. No one notices how much he drinks because there is a nonalcoholic version of the same punch on a nearby table. Bill has a serious accident on the way home and will be permanently disabled. Explain how Rick and Jane will be held liable in a lawsuit which alleges negligence for serving alcohol to a minor.