Muslim Inter-marriage

When I worked in Saudi Arabia, I was told that the almost universal marriage custom
triball
among Saudis was for a father's brother's daughter marry the son of the father. Stanley Kurtz at the NRO link above explains how this "parallel-cousin" marriage custom is almost completely restricted to Islamic countries [other close-kin societies prefer cross-cousin marriages---read the Kurtz article for details].

Read this incredibly interesting examination of why Muslims have great difficulty in assimilating---in Londonistan or France or Hamtramck or elsewhere in their diaspora---because of the "self-sealing" consequences of parallel-cousin societies.