In regards to time, there has historically been considerable debate regarding the emergence of the nuclear family. For example, one of the founders of sociology, Max Weber, attributed all family structural changes to the social changes spawned by the industrial revolution. The impact of technological change and the increase of material wealth that occurred during the industrial revolution seriously affect family and social relationships and structures. The new principles of the social structure caused a shift from extended family households to nuclear ones. Until now, the predominance of the nuclear family household that plays a dominant role in the family structures, even though there are many factors that have altered the patterns of the families.
             As time goes by, the different forms of family co-exist due to the conglomeration of social forces. For instance, many women shifted their focus from home to career. They need to share the financial burden in the family. But dual-career marriages experience many stresses: problems maintaining a home without a full-time homemaker, conflicts over the equitable distribution of housework, and severe dilemmas involving the timing of childbearing and the adjustable of careers to parenting. Therefore, it is hard to maintain a marriage. In fact, many women may now choose to postpone their marriages rather than accept an unfair burden of a family. They may choose other alternatives as living in common-law relationships. Factors that are entering into this shift include altered economic conditions for women, delayed age for first marriage and dissatisfaction with marriage or fear of failure in a marriage relationship. This kind of "non-traditional families" pursues the ideal of companionship that can get rid of the restrictions of marital roles and norms. The popularity of the single life, in general, illustrates the desire for autonomy. The ideals of independence and personal growth that are pu...