Kamholz (2014) classifies Warembori and Yoke each as coordinate primary subgroups of the South Halmahera–West New Guinea languages.
The singular prefixes resemble Kwerba languages, but Lower Mamberamo has nothing else in common with that family.
At the 'Ambermo' (Mamberamo) River at the eastern extent of his coverage, he collected tenama '1' and bisa '2' from an unnamed language.
However, he notes that the people only 'count' by means of singular and plural, so it is doubtful whether tenama and bisa are actually numerals.
[4] Reconstructed independent pronouns in proto-Lower Mamberamo are:[3] Foley observes that there are likely similarities with Austronesian languages, likely due to contact.