In the world there are different forms of family groups. In modern western societies, a family group is usually small, made up of a man, his wife, and his children. About a hundred years ago, it was usually a little larger than this. Unmarried sons and daughters were part of the family even after they were grown up. Now unmarried sons and daughters do not always live with their parents after they begin to work. They often live in their own houses or rooms. In other societies, family groups are quite different. In some places, a man may have more than one wife. When two or more wives live together with their husband in the same home , brothers or sisters (or both) have the same father but different mothers. In these families the younger children sleep in their mother’s rooms, but all the older boys may sleep together in a larger room and all the older girls in another. The first wife often has special place in this kind of family. Her husband asks or her suggestion when he takes his other wives, and she tells them what work they must do.