The document introduces different types of families including nuclear families, extended families, step-families, one-parent families, same-sex families, childless families, common-law families, foster families, and adoptive families. A nuclear family consists of parents and their children. An extended family includes parents, children, grandparents, aunts, and uncles living together across generations. A step-family is formed when one or both parents have children from a previous relationship and they live together.