The patriarchal family, which prevailed among the ancient Hebrews, Greeks, and Romans, is often associated with polygamy (see marriage). In Rome, the paterfamilias was the only person recognized as an independent individual under the law. He possessed all religious rights as priest of the family ancestor cult, all economic rights as sole owner of the family property, and power of life and death over the members of the family. At his death, his name, property, and authority descended to his male heirs. The Roman system was transferred in many of its details into both the canon and secular law of Western Europe.
In the 19th cent., when the Western nations began to grant women equal rights with men with respect to the ownership of property (see husband and wife), the control of children (see parent and child), divorce, and the like, basic changes took place in the structure of the family, and the rights and protections associated with it. The state has also intervened to modify the authority of parents over their children. At the same time, education has shifted increasingly from the household to the school. The effect has been to loosen traditional family ties. In Western Europe, where legislation provides equal financial benefits and legal standing to all children, families have increasingly come to consist of one or two unwed parents and children, especially in Scandinavia and other parts of N Europe. The trend toward unwed parents has also occurred in the United States, where about 40% of children in the early 21st cent. were born to unwed mothers.
Another factor affecting the modern Euro-American family was the Industrial Revolution, which removed from the home to the factory many economic tasks, such as baking, spinning, and weaving. Economic and social conditions have discouraged the presence of the husband and father in the home; in industrial communities the wife and mother also is often employed outside the home, leaving the children to be cared for by others. Sociologists and psychologists find in these changed relations of the members of the family to each other and of the family to the community at large the source of many problems such as divorce, mental illness, and juvenile delinquency.