Final answer:
The practice where one woman is married to all of the brothers in a family in some parts of Tibet is known as polyandry, a form of marriage where a woman has multiple husbands simultaneously.
Step-by-step explanation:
In certain remote parts of Tibet, the practice where one woman becomes married to all of the brothers in a particular family is best described by the term polyandry. This form of marriage involves one woman being married to more than one man at the same time. Another term related to marriage customs is polygamy, which is the state of being committed or married to more than one person at a time. Specifically, when one man is married to multiple women, it is known as polygyny. Polyandry is relatively rare worldwide, representing approximately 1 percent of global cultures, and is sometimes practiced to manage resources and inheritance, minimize population growth, and provide stability within familial units.