Lak is in the Patpatar-Tolai Sub-Group, which falls under the New Ireland-Tolai Group in the Western Oceanic language, a sub-group within the Austronesian family.
Lak is in the Patpatar-Tolai Sub-Group-Tolai Group in the Western Oceanic language. Tolai Group in the Western Oceanic language is a sub-group within the Austronesian family. Tolai Sub-Group falls under the New Ireland.