Watta satta
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Watta satta (Urdu: وٹہ سٹہ) is a tribal custom in Pakistan of exchange of brides between two families. Watta-Satta is the practice of bartering bride for bride. In other words, at the time of marriage, both families trade brides. In order for you to marry off your son, you must also have a daughter to marry off in return. If there is no sister to exchange in return for a son's spouse, a cousin, or a female relative can be bartered off as well.