Which type of family structure includes a father, mother, and all their children including the son's wives and children?

The correct answer is the extended family. This type of family structure encompasses not only the parents and their biological children but also includes additional relatives such as the son's wives and their children. Extended families often consist of multiple generations living together or maintaining close ties, which can include grandparents, aunts, uncles, and cousins, in addition to the nuclear family unit.

In contrast, the nuclear family is defined as just the parents and their children, excluding any extended relatives. A single-parent family consists of one parent raising their children independently, while a blended family is formed when one or both partners bring children from previous relationships into a new partnership. Each of these family structures has distinct characteristics, but the key element of an extended family is its inclusion of a broader network of relatives beyond just the immediate household.