Comparative Study of the Effect of Sibling Number on the Family Institution Members Poverty in the Different Countries

The general belief is that more children is equal to more poverty. The question is in reality does family poverty increase along with its size? We have discussed this question in two ways: I) in the same time, are larger families poorer? II) In a family by children addition over time will the family be poorer? This article tries to answer these questions using meta-analysis of empirical researches in different countries. In answer to the first question, some researches show the increase in household size result in more poverty. But other researches offering concepts such as equivalence scale and size elasticity in calculating the poverty level show the relationship depends on the countries conditions. In some conditions larger families are in more welfare. To answer the second question, studies show that by more children over time a family adapted itself, and not only be poorer, but its income and assets are added. Totally the relationship between family size and poverty is not always positive or negative, but depends on economic, social and cultural conditions. Hence, policies are suggested for changing the relationship direction in larger families to be in more welfare.