Final answer:
Nuclear families consist of a married couple and their children, extended families include multiple family units, multiracial families are formed by individuals from different racial backgrounds, and same-sex families are formed by couples of the same gender.
Step-by-step explanation:
Nuclear Family: The nuclear family is a family unit consisting of a married couple and their children. It is the most common type of family in Western societies. Trends in nuclear families may include smaller family sizes, delayed marriage, and dual-income households.
Extended Family: The extended family includes two or more family units functioning as a single integrated family. It may involve multiple generations, polygamous families, or married siblings living together. Extended families are most commonly associated with agricultural societies and are still prevalent worldwide.
Multiracial Families: Multiracial families are formed when individuals from different racial backgrounds marry and have children. These families reflect the increasing diversity and multiculturalism in today's society.
Same-Sex Families: Same-sex families are formed by couples of the same gender who are married or in a committed relationship. This family type has become more accepted and recognized in many countries, allowing same-sex couples to have legal rights and protections.