This system has many advantages. Remember that westerners are usually very independent; they like to do thing for themselves. When their children finish school, they are usually ready to move into a house of their owe. This is true for the parents, also; they want their children to begin making decisions about their own lives. Many people in america would think it's strange for a grown son or daughter to live in the same house as the parents; they might say that the children are too lazy to get a house of their own. There are disadvantages to the nuclear family, too. The main problem occurs when the parents get very old; often the children cannot take responsibility for the parents, and might send them to a special hospital for old people.