Family structures refer to the composition and organization of a family unit. Common types include nuclear families, which consist of two parents and their children, and extended families, which include additional relatives like grandparents, aunts, and uncles. Other variations include single-parent families, where one parent raises the children, and blended families, formed when one or both partners have children from previous relationships. These structures can vary widely across cultures and societies. For instance, in some cultures, extended families are the norm, providing a support system for child-rearing and caregiving. Understanding different family structures helps in recognizing the diverse ways people live and interact within their communities.