The traditional "dyula" social structure is further organized into various familial clan groups, and clan affiliation continues to be a dominant aspect of both collective and individual identity. People are fiercely loyal to their clan lineage, often expressing their cultural history and devotion through the oral traditions of dance and storytelling. The "dyula" are patrilineal and patriarchal, with older males possessing the most power and influence. Men and women commonly reside in separate houses made of mud or cement - men occupying roundhouses and women in rectangular ones. The father heads the family, and inheritances are passed down from fathers to their sons. Despite being illegal, the "dyula" still practice polygamy, and young people are often encouraged to marry within their own clan.