Historically, cousin marriages took place for two reasons - to keep all the wealth within the family and secondly girls never got out so for their safety, boys within the family were chosen.
In Hindus, these reasons were applied, as long as it was within the gotra system. In the gotra system, intermarriage within a family is prohibited if the two members descend from a common mythical ancestor. So weirdly, in Hindu families the gotra system was to increase lineage - broaden the influence of one gotra into another, which is complete opposite of keeping everything within the family. This was not about wealth, but about everything, intellect, wealth, inspiration and aspirations. In fact, in Hindus any marriage is not preferred within the gotra. So many times cousins marriage doesn’t fit within the gotra rule, except in cases of second cousins which only exists in very very few communities - such as Malayalam and Telugu speaking comms.
There is enough scientific proof to state that children of first cousins have risk of recessive genetic disorder, but not conclusive in the case for second cousins.
That said, in this time and age, frankly it is a bit of an eye roll. My friend who is Telugu tells me she gets so annoyed when in most Telugu movies the automatic is second cousins marrying. Again, this must come down to how girls must have agency - they should be allowed to choose.
Edited by columbia - 2 years ago
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