Nestled in the Bay of Bengal, between India and Burma, there is a cluster of archipelagic islands known as the Andaman Islands. Consisting of over 200 islands total, this territory is home to the Andamanese people, a collection of indigenous cultures that have been present in this location since pre-neolithic times, ca. 60,000 years ago. Four primary tribal identities are to be distinguished in the Andaman group. There are the Great Andamanese tribes (a highly endangered group once consisting of ten distinct tribes that have more or less coalesced into one), the Jarawa, the Onge, and the Sentinelese.
First contact with most of the tribes has occurred within the last 300 years, but some Andaman groups, such as the Jarawa, have encountered mainlanders only very recently. The first contact with this tribe is believed to have been established in 1997. However, the Sentinelese tribe has yet to be successfully contacted by the Indian government, anthropologists or any other mainlanders. According to the testimonies of those who have tried to make contact, the Sentinelese violently reject contact with outsiders.
Andamanese linguistics is very important to the revitalization of indigenous languages whose population of native speakers is declining. Based on a demographics survey done twelve years ago, the Jarawa population had been reduced to 300, the Onge to 105, and the Great Andamanese to 40. Since then, at least one of the Great Andamanese tribes has gone completely extinct. This was the Aka-Bo tribe, whose last speaker died earlier this year.
Part of the urgency associated with preserving Andamanese languages is that relatively little is known about them. For example, there is still uncertainty about the basic historical relationships among these languages, and whether or not they can even be classified under one language family. Traditionally, all of the languages spoken on these islands are classified under the Andamanese language family, which can be divided into the Little Andaman Group and the Great Andaman Group. The former includes Onge, Jarawa, and presumably Sentinelese (though linguists haven't gotten to this one yet), while the Great Andamanese languages belong to the latter. However, a more recent study argues that Onge and Jarawa are typologically distinct from the Great Andamanese languages. Under this theory, it's proposed that Onge and Jarawa actually descend from Proto-Austronesian and that only the Great Andamanese languages can be classified under the Andamanese family. Ultimately, the decision of how to classify these languages has not yet reached conclusion.
However, one feature suggesting that all of these languages are in fact related is the way in which each treats a certain type of grammatical possession. Possession is a very broad linguistic domain that Chomsky includes in his theory of universal grammar. As such, we expect every human language to have some means of expressing notions of possession. In the same vein, we can also expect a great deal of variability in how possession is expressed across languages.