General information about Tobian from Ethnologue.com

Tobian, a language of Palau.
Population 22 or more (1995 J. Ellis SIL).
Region Tobi (Hatobohei) Island and near the capitol.
Alternate names TOBI, HATOBOHEI
Classification Austronesian, Malayo-Polynesian, Central-Eastern,
Eastern Malayo-Polynesian, Oceanic, Central-Eastern Oceanic, Remote Oceanic,
Micronesian, Micronesian Proper, Ponapeic-Trukic, Trukic.
Comments There are significant linguistic differences between Tobian and Sonsorolese,
although they are often treated as one language.
Reported to be highly bilingual in Palauan and bicultural.
Investigation needed: bilingual proficiency in Palauan.