AMSTETTEN, Austria (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 in Amstetten 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. Amstetten is a rural town about 150 km (93 miles) west of Vienna.
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.
What I would want to know is how on earth this guy kept up this chirade for over two decades. To put it in perspective, according to this story this man was holding his daughter hostage two years longer than I have been alive. Unbelievable.