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Old extended family hold two advantages.One is resilience, extended family members' mutual help.Another one is socializing force, various adults' social enlightenment for children.

Because of youths' leaving big family for separate creditable positions in the fast developing society, extended family gradually changes into nuclear family.

Nuclear family structure focusing more on the development of individuals than the interconnection between family members leads to a social desire for interpersonal activities.

Xiangjiu Shi

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Nuclear family gradually have been replaced nowadays, this is a new era of extended family . On the one hand, the main task of marriage has changed and the age to get married later than before. On the other hand,  due to the social environment, not only for the financial and social reasons, but also the awareness of taking care of parents, young people back to their home.

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During this time, the mainstream family ideal was: a married couple with 2 children lived in a separate family house on a suburban street.
Only a few North American families are now traditional two-parent families, and only one-third live in this family.

tingyu Qian

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Nowadays, there is a new trend that  the aged are likely to live with their children. This trend even changes the structure of their house. The house for extended families are redesigned to larger one with different rooms for different family members.
The nuclear family is disappearing gradually, and it will be probably replaced by extended family. It is an excellent chance for people to get closer with their family members and develop their relationships.