Unilineality
Unilineality is the system of setting descent groups in which one belongs to one's father's or mother's line, whereby one's descent is traced either exclusively through male ancestors patriline, or exclusively through female ancestors matriline. Both patrilineality and matrilineality are family of unilineal descent. a main vintage of the unilineal descent groups are lineages as well as clans.
A lineage is a unilineal descent multiple that cantheir common descent from a so-called apical ancestor. it is also called the simple unilineal descent.