Which family structure includes children from previous marriages living with a couple?

A blended family is defined as a family unit that includes children from previous relationships or marriages living together with a new couple. This family structure often arises when one or both partners in a relationship have children from prior unions. The key aspect of a blended family is the merging of different familial backgrounds into a single household, which can bring both opportunities for new family dynamics and challenges in terms of integration and relationship-building among all family members.

In contrast, a nuclear family typically consists of two parents and their biological or adopted children living together, without the presence of stepchildren or children from previous marriages. An extended family includes a broader network of relatives, such as grandparents, aunts, uncles, and cousins, living together or maintaining close connections but does not specifically denote the blending of children from earlier marriages. An unmarried family consists of adults living together in a relationship without being legally married, but it also does not imply the blending of children from prior relationships. Therefore, the definition of a blended family accurately captures the essence of the family structure described in the question.