Social host laws in some jurisdictions hold adult property owners responsible whether or not they were aware of the party or provided the alcohol. (MomsTeam.com)
Based on the present state of social host law in Massachusetts, and without more facts, this may be a case, as in MacDougall, where the parent had no duty to the guests, and in particular to this girl, if she voluntarily consumed alcohol to excess, and drowned as a result. (bostonaccidentinjurylawyer.com)