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 be purposes to get married. 

A man can't married a women even she is not from the same clan but having the same Surname because. Also a man or a women have to married to whom who have different title or different surname.

In the Khasi Community there are several Title or clan where having relationship among others title or clan which is prohibit to get married for those who involve in the clan or title and feel them as brother and sister even the title is different. They can't married not because the title is the same but some how the elder already taught children that our clan having a relationship with several Title which is very strictly prohibited to get married. And in some case those who married with that in the relationship the clan or the clan society will derecognise those family member who involve to break the rule of the prohibition that restrictly formulate by the clan elders.

In this case thou the married came in a very slow process and people have to chose wisely or operate smoothly in order to free from the incest and taboo. When compared to other community like general and so many community in India married is done when the same title is married to Each other.

Member of the same clan also is not prohibited to get married to each other unless brother or sisiter from the same Grandmother if they are from the same clan but from different grandmother or grandfather it is save for general people in India to get married. 

And married goes very easily among them that there is no incest and taboo like tribals people does and prohibit. Tribals people are loyal and believe that the doctrine if gone through then some might went wrong to the family who involve for incest and taboo.

But most of the time people are aware of what the duty go before they getting married and married life is not simple as general people but Tribals are hard and must determine the matter of fact before building such a family especially in the Society where they adopt a Matrilineal System.