Final answer:
A remarried couple with at least one stepchild living with them is defined as a blended family. This reflects the diversity of family structures in modern society, differentiating from the traditional nuclear family or extended family. Option D is correct.
Step-by-step explanation:
A remarried couple that has at least 1 stepchild living with them is defined as a blended family. Blended families come into existence when one or both partners have children from previous relationships and those children begin living with the new step-parent and any children the couple may have together. Given the variety in family structures, the nuclear family, typically thought of as two married parents and their biological children, no longer reflects the majority of U.S. households.
Alternatively, an extended family includes not only the parents and children but also other relatives such as grandparents, aunts, uncles, and cousins, whether they live together or not. The extended family concept is more prevalent in agriculturally based societies or during times of economic hardship, while the blended family structure is more associated with societies where serial monogamy is common, like in the United States.
Modern U.S. society has witnessed an increase in various forms of non-traditional families, including single parents, same-sex parents, cohabitating parents, and blended families, challenging the long-standing paradigm of the nuclear family as the sole definition of a family unit.