What does state law say?
Current state criminal statutes do not address social hosting. However, some communities may have local ordinances on social hosting that can include fines and other penalties.
Can the adult be sued?
Social hosts who serves or furnishes an intoxicating beverage to a person over the lawful age is not liable to the person (or any other person or the estate) for any damages caused by the intoxication. In addition, a social host is not liable for damages caused by the intoxication of a person who consumed, in the absence and without the consent of the host, intoxicating beverages on a premise owned, leased, or otherwise legally occupied by the host.