In Afghanistan, among all these communities, patrilateral-parallel-cousin marriages as well as exchange marriages among siblings were preferred. In such marriages, bride-price was lower than usual. Among the Ghorbat, polygyny was very rare, but among the Baluch, polygyny was common, and additionally many of the wealthier men had concubines. In Iran, Kowli women were reportedly married from the age of 10 upward, whereas the men married around age 16. Polygyny was not infrequent. In Turkey, the basic domestic unit of the Tahtacı is the nuclear family, and the youngest son is considered responsible for the welfare of the elderly parents.