What significant change has occurred in children's living arrangements in the twenty-first century?

In the twenty-first century, there has been an observable increase in children living with solo or cohabiting parents. This change reflects broader societal trends, including shifts in family structure, values, and economic conditions. Many factors contribute to this phenomenon, such as changing attitudes toward marriage, a rise in the acceptance of non-traditional family arrangements, and economic factors that may make it difficult for individuals to maintain a conventional family structure.

As a result, more children are being raised in households where their parents are not legally married or may not be residing together in a traditional family unit. This shift demonstrates a diversification of family forms and underscores the evolving nature of what constitutes a family in contemporary society.

The other options, while also reflecting changes in family dynamics, do not encapsulate the most significant trend observed in recent years regarding children's living arrangements. For instance, while multi-generational households have seen an uptick, the data indicates that the presence of solo or cohabiting parents represents a more pronounced and transformative shift in the family landscape today.