Abstract
This article analyses the contribution of fictive kinship ties established between different ethno-religious groups to intergroup relations and social solidarity. Fictive kinship refers to close relations between the parties, out of kinship established by marriage or blood tie, and associated to conventional kinship terms. These relations would provide people moral and financial support more than formal ones. Based on ethnographic data, this article analyses fictive kinship ties established by milk kinship and kirvelik between different groups in Mardin. Milk kinship is a practice specified by religious rules; however, kirvelik is an institution based on socio-cultural agreement, and strongly related to circumcision ritual. Both are socially accepted; milk kinship is mostly practiced between Muslims and Syriacs while kirvelik is practiced between Muslims and Ezidis. The article firstly appeals to the existing literature on fictive kinship to examine these ties. Later it evaluates the examples of fictive kinship in Mardin, and their effects on intergroup relations. Finally, the article refers to the significance of intergroup marriage prohibition evident in these kinship examples.