Friends and other family members couldn't immediately be reached or declined to publicly discuss Pola Kinski's allegations.
An agent for Nastassja Kinski, Pola's younger half-sister from her father's second marriage, said she was "not commenting just yet."
One of Kinski's biographers, Peter Geyer, also declined to comment.
Although she said she told her mother of the alleged abuse when she was 19, Pola Kinski said she only felt real relief when her father died in 1991.
The German government's commissioner for sexual abuse issues said Thursday the allegations against Kinski showed how hard it was for victims to break their silence.
"Pola Kinski needed 20 years to say how terribly she was abused by her father for years," Johannes-Wilhelm Roerig told German public television station ZDF.