Which of the following best describes a nuclear family?

A nuclear family is characterized as a family unit consisting of two parents and their biological or adopted children living together in a single household. This definition emphasizes the relationship between parents and their own children, highlighting the core structure of family life. The nuclear family is often seen as the traditional family model in many societies, where the emphasis is on the immediate family members who share both legal and emotional ties.

The other options describe different family configurations or living arrangements that do not fit the traditional definition of a nuclear family. For example, a group of extended relatives would fall under the category of extended family, which includes a broader range of relatives beyond the immediate parents and their offspring. Families without any children do not fulfill the complete definition of a nuclear family since the presence of children is essential. Lastly, two or more unrelated individuals living together pertains more to non-family arrangements, such as roommates or friends sharing living space, rather than indicating a familial relationship.