Cousin marriages are also a thing, while already relatively marginally thing, completes gets dropped by Africans in the west.
It's actually so insane, the rate is 50%. Pakistanis are one-two generations removed from turning into habsburgs.
Every notable scholar in Islam has spoken out against it: “There is not a group of people who do not bring forth their women to marry men other than their own men, nor do their men go forth to marry women other than their own, except their children will be fools (i.e. born with a mental defect)” [Adaab ash-Shaafi’ee wa Manaaqibuhu (pg. 99)
Al-Shafi’i reports Umar ibn al Khattab (RA) to have said, “Whenever the people of a household do not allow their women to marry men outside of their line, there will be fools among their children.”