Final answer:
Both parents working in a family designate it as a (2) dual-income household, whereas single-income refers to households with only one parent working. The nuclear family concept undergoes changes, as society now includes diverse family structures such as single-parent and dual-income households.
Step-by-step explanation:
Families in which both parents work are referred to as either single-income or dual-income households. However, when referring specifically to households where both parents work, we use the term dual-income. In contrast, a single-income household is one where only one parent or partner is earning an income.
Furthermore, it is noteworthy that the vast majority of U.S. children live in two-parent households, which can be dual-income if both parents are working. The concept of the nuclear family, traditionally seen as a household with two married parents and their children, is also evolving. Changes in family structure, including an increase in two-earner couples and single-parent families, have influenced family dynamics and contributed to income inequality.
Despite the variations in family life, current data suggests that the traditional model of the nuclear family is still prevalent, but is no longer the only acceptable family structure. There are increases in cohabitation, same-sex partnerships, and single-parent households, all of which are altering the traditional ideas of marriage and the nuclear family.