clipped from: www.cnn.com 
The family rescued from the house are getting to know each other again in their hospital quarters, police said.
Authorities in Austria were Monday giving the latest details in the case of Josef Fritzl, who locked his daughter Elisabeth in a cellar for 24 years and fathered children by her.
They told reporters during a news conference in Amstetten, west of Vienna, that as more children were born, the cellar was expanded, with Elisabeth and her children helping Josef Fritzl in the construction of their prison.
It is thought that Fritzl used about 500 kilograms of concrete, which was reinforced, in building the cellar, which was around 35 square meters.