This study aims to determine the kinship relationship between Lorang, Barakai, and Double languages in the Aru Islands Regency, Maluku Province through lexicostatistical studies. In addition to this language being in the same geographical area, it also has some of the same vocabularies so that it is very possible to have linguistic kinship both phonemically and lexically. To prove this assumption, linguistic research needs to be done by documenting the three languages. This study uses a quantitative approach with the method lexicostatistics. The purpose of this research is the kinship relationship between Lorang language, Barakai language, and Double language. Data collection was carried out using direct observation, listening, and recording methods. The results showed that the three languages are still related as language families. The percentage of kinship/kinship between Lorang language and Barakai language is 52%, Lorang language is Double language is 46%, and Barakai language is Double language is 68%. Meanwhile, the separation time between the Lorang language and the Barakai language was about six thousand years ago, between the Lorang language and the Double language about 18 thousand years ago, and between the Barakai language and the Double language it is estimated to have separated about two thousand years ago.