Watta satta

Watta satta (وٹہ سٹہ) is a tribal custom in Pakistan of exchanging brides between two families. At the time of marriage, both families trade brides. That is, both families must have a daughter and a son and be willing to betroth them to a daughter and son of the other family. For example, in order for one to marry off his son, he must also have a daughter to marry off in return to the same family.