Increase in 'concealed families' in last decade

The number of families living in a household with another family rose by 70% between 2001 and 2011.

"Concealed families", as they are known, increased from 170,000 to 289,000 in that decade, according to figures from the Office of National Statistics - ten times the rate of unconcealed families.

The rising number of concealed families may be due in part to economic reasons or cultural traditions. Credit: PA

Concealed families include couples, parents or single parents that live in the household of another family - the "primary family".

The two families are often from the same extended family: for example, two parents, their daughter and her husband all living in the same house.

The ONS says the statistics are a useful indicator of housing demand for house building and planning in the future.