Among the Basaa people, the term " yandom" is a reciprocal term of address for offspring on the one hand, and members of their mother's patriclan on the other. A yandom is an offspring of a sister in marriage. "Ba yandom" (plural) designates the entire clan of mother's origin. The term " yandom ni ba yandom" expresses a specifiable set of attitudes in the relations among these two categories of individuals, and claims of rights in one another.Social anthropologists have examined these relations under various rubrics namely, "the mother right," "the mother's brother," "the sister's son," "the daughter's child," and "avuncular relationships." We retain the term, "avuncular relationships." The Basaa term " yandom ni ba yandom" would be the corresponding term. In this study, we examine avuncular relationships in the purview of the Basaa ideology of descent.