It's a bit hard to understand how the wife had no idea

Really disturbing story found on CNN this morning. In 24 years the wife never wondered about the cellar?

Police: Captive woman had at least 6 children by father

(CNN) -- Austrian police believe a 73-year-old man held his daughter captive in his cellar for the past two decades and fathered at least six children with her, according to police and state-run news reports Sunday.

The woman, identified as 42-year-old Elisabeth F., has been missing since 1984 when she was 18 years old, police said at a news conference.

The situation came to light earlier this month after her daughter -- a 19-year-old woman, identified as Kristen F. -- was hospitalized after falling unconscious, according to police.

She was admitted to a hospital in Amstetten, outside Vienna, by her grandfather with a note from her biological mother requesting help.

But police said a DNA test later revealed her grandfather, Josef F., was also her father, according to ORF, Austria's state-run news agency.

That sparked a police investigation which revealed that Josef F. may have fathered at least six children with his daughter, forcing her and three of the surviving children to live in the cellar of his house, according to ORF's Peter Schmitzberger.

The children are now between the ages of 5 and 19 years old.