In traditional inheritance rules, only males had rights over the land, but where there were no males to inherit them, the daughters had the right over the corporation’s land.To maintain the familial estate unit, the daughters would share a bridegroom who will move matrilocally (as opposed to the patrilocal principle where the brides move into the husband's family) and become a member of his wife's family.Bigenerational polygamy was present as an application of the mono-marital principle.Let us consider a family in which the mother died before the son was married.In Goldstein's research about the Gyantse district specifically, he found them owning typically from 20 acres (81,000 m) of land each.Their primary civil responsibility was to pay taxes (tre-ba and khral-pa means "taxpayer"), and to supply corvée services that included both human and animal labor to their district authority.
The population was further divided into social classes: These wealthier family units hereditarily owned estates leased from their district authority, complete with land titles.
Studies have attempted to explain the existence of polyandry in Tibet.
One reason put forward in traditional literature is that by not allowing land to be split between brothers, Tibetan families retained farms sufficiently large to continue supporting their family.
Tibetan inheritance rules gave all males of the family, the right to claim a part of the family estate, so if each son took a different bride, there would be different conjugal families, and this would lead to the partitioning of the land among the different sons' families.
To avoid this situation, the solution was a fraternal polyandrous marriage, where the brothers would share a bride.