Family size is -
Family size 

Family size means the total number of children a woman has born at a point in time.
The completed family size indicates the total number of children borne by a woman during her child bearing age (15 - 45 years).
The total fertility rate gives the approximate magnitude of the completed family size. 
The family planning programme's campaign is currently based on the theme of a "two-child"family norm, with a view to reach the long-term demographic goal of NRR = 1