Every subgroup is organized around a set of brothers, each of whom is often married to women who are sisters. Polygyny, especially sororal polygyny (co-wives are sisters), is the basis of the Wariʼ family structure. Villages are made up of nuclear families and a separate house, called "the men's house". It serves as a dormitory for single adolescents and as a meeting place for adult men. A couple usually varies their place of residence, shifting between the woman's parents' and the man's parents', although no specific rule determines when the shift is made.