This dataset provides 2011 Census estimates that classify families in England and Wales by family type, by dependent children and by age of Family Reference Person (FRP). The estimates are as at census day, 27 March 2011. A concealed family is one that does not include the Household Reference Person (HRP).

In order to protect against disclosure of personal information from the 2011 Census, there has been swapping of records in the Census database between different geographic areas, and so some counts will be affected. In the main, the greatest effects will be at the lowest geographies, since the record swapping is targeted towards those households with unusual characteristics in small areas.

More details on the ONS Census disclosure control strategy may be found on the http://www.ons.gov.uk/ons/guide-method/census/2011/census-data/2011-census-prospectus/new-developments-for-2011-census-results/statistical-disclosure-control/index.html[Statistical Disclosure Control] page on the ONS web site.