Family structures can vary widely, but they generally fall into a few main categories. The most common type is the nuclear family, which consists of two parents and their children living together. Other types include extended families, where relatives such as grandparents, aunts, or uncles also reside in the same household, and single-parent families, led by one parent raising their children. Another type is the blended family, formed when one or both partners have children from previous relationships. Additionally, childless families consist of couples without children, while same-sex families include couples of the same gender raising children together. Each structure has its unique dynamics and challenges.