Question

In certain remote parts of tibet, one woman will become married to all of the brothers in a particular family. which term best describes this practice?

Answer 1

I believe the answer is: polyandry

Polyandry is a form of relationship where one female have multiple male partners at the same time.
This type of relationship is usually to be very rare considering the amount polygamous relationship. But in south Asian region, there are still some cultures that preserve polyandry relationship.