Northeast Tribals are slightly in increasing of population due to Incest and taboo
It's not an excuse however when compared to others like people in General across India and the people who belong to the identity of tribals who they perform and excercise their own culture and traditional. One of the most followed practice of, done by tribal people is in the marriage and several rule and moral law that ancestors inherite the ideas and thoughts of what it should known that it's a culture and have to practice it. Incest and taboo is the main concept in which society like Khasi tribe People adopt the system of Incest and taboo up to day. Incest and taboo is not a law which enforce from the administration but it's a morality that people naturally excercising and teaching children naturally. In the system married can't be done with the same Surname or title whether in married of the two. The same when the he or she's title is same to his or her partner father's title that's also consider to be incest and if its from the same clan also can't