Final answer:
About 9% of all children in the U.S. live with their grandparents, as part of an extended family structure, which is becoming increasingly common with 20% of the population living in multigenerational households.
Step-by-step explanation:
Approximately 9% of all children in the United States live with one or more of their grandparents. The practice has become more widespread in contemporary family structures, which often include extended family members such as grandparents, aunts, uncles, and cousins living together. This setup is part of what is known as an extended family arrangement. The percentage of children living in these multigenerational households has seen a significant increase. A Pew Research Center analysis showed that in 2010, 49 million Americans lived in homes with at least two adult generations or a grandparent and at least one other generation, a number that grew to 64 million by 2016. This change reflects approximately 20% of the population living in multigenerational households.