Kin Groups and Descent. Chimbu view their kin groups as consisting of patrilineal segments, "brother" groups, which have descended from a common patrilineal "father" ancestor. The clan, with an average population of 600-800, is the usual unit of exogamy. Clan names are often taken from the ancestral founder's name combined with a suffix meaning "rope." Clans are further divided into subclans, kin groups with Between 50 and 250 persons. The subclan group is often the main organizing unit at ceremonial events, such as marriages and funerals, and subclan members undertake some joint agricultural activities. Smaller groups are sometimes identified within the subclan. These "one blood" or men's house groups consist of close agnates or lineage mates.
Kinship Terminology. Kinship terms are classiftcatory by generation and bifurcate merging, distinguishing sex and relative age among siblings and father's siblings.