The family unit at one time cared for both the larger society and for its members. Children, elders, and incapacitated members were the responsibility of the extended family. The nuclear family and single parent families, while perhaps economically viable, are not capable of caring for the larger needs of the larger family.
The splitting up of the nuclear family between husband/wife, parents/children, sons/daughters is a critical factor in the breakdown of the extended family where grandparents, grandchildren, in-laws, uncles, aunts, cousins and others are in close relationship. A secondary cause is mobility, which uproots part of the extended family and takes it to a totally different region or even country. Other obstacles to extended families include the belief that the state can and should take care of senior citizens, the belief in having fewer or no children, and the erosion of community life.