Berlin ( CNN ) -- A German man who pleaded guilty to sexually abusing his daughter , stepdaughter and stepson was sentenced to more than 14 years in prison Tuesday , a court official said . The man , identified only as Detlef S. , was accused of hundreds of incidents of sexual abuse of his children between autumn 1987 and summer 2010 . He pleaded guilty on Monday to all charges , said Alexander Walter , Koblenz state court spokesman . He was convicted of severe sexual abuse of children in 42 cases , rape , sexual abuse of wards and sponsoring rape , Walter said . He was sentenced to 14 and a half years in prison , and will stay in preventive custody after that because the court feared he would commit further criminal acts , Walter said . Preventive custody usually means that a person who has served their sentence remains behind bars but receives extra privileges . Detlef S. admitted last month when the trial opened that he was the father of multiple children with his stepdaughter . He was charged with the sexual abuse of dependents and facilitating the sexual abuse of minors . He was also accused of bringing his underage stepdaughter and his daughter to men who paid for sex with them on multiple occasions . The first allegations of abuse came more than a decade ago , in 1998 , but there was no medical evidence to support the claims then , Germany 's youth welfare office said in a statement when the trial opened February 15 . Two stepsons leveled fresh accusations in 2002 , saying the defendant was abusing his biological daughter , then 11 . Police began an investigation but found no medical evidence and dropped the case , the statement said . The daughter denied having been abused , the welfare office said . Two men other men are facing trial on charges of sexual assault in connection with the case . A third man suspected of abusing the children has died , Walter said . The stepdaughter gave evidence against Detlef S. , the court spokesman said . It was unclear at what age she gave birth to the children . DNA test results introduced in court gave a `` 99.999 % '' certainty that the defendant is the father of her children , Walter said . Seven of the stepdaughter 's eight children survived infancy , he said . He did not know the cause of death of the eighth . The sexual assaults took place in the defendant 's home , in woods nearby and in various apartments near where the family lived , prosecutors alleged . Only two of the 350 charges are related to the stepson , Walter said . CNN 's Diana Magnay contributed to this report .
There were allegations against Detlef S. for more than a decade , officials say . He was accused of 350 incidents of abuse of his daughter , stepdaughter and stepson . He admits fathering the children but denies sexual abuse , the court says . He was also accused of providing his daughter and stepdaughter to men who paid for sex with them .