You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Family size is - and explain in detail?
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