Father says he held daughter prisoner for nearly 24 years , fathered 7 children NEW : Mother say that Fritzl forced her to write letter saying she had run away . Fritzl lived upstairs with his wife , Rosemarie , who police said had no idea about her husband 's other family living in the cellar . The daughter , now missing , has been missing since 1984 , when she was 18 , children fathered by Fritzl imprisoned with her had never seen him .
Father says he held daughter prisoner for nearly 24 years , fathered 7 children NEW : Mother say that Fritzl forced her to write letter saying she had run away . The daughter , now missing , has been missing since 1984 , when she was 18 , children fathered by Fritzl imprisoned with her had never seen him .