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A man who fathered nine children by raping his two daughters over many years has been jailed for life with a minimum term of 19-and-a half years.
The 56-year-old from Sheffield was sentenced to a life term for each of the 25 rapes he had admitted.
The attacks led to 19 pregnancies, Sheffield Crown Court heard.
Judge Alan Goldsack QC said the case was the worst he had come across in nearly 40 years of dealing with criminal cases.
Nine of the children were born, two of whom died on the day of their birth. The other 10 pregnancies were miscarried or aborted.
Ian Keates, for the Crown Prosecution Service in South Yorkshire, said: "The abuse to which the women have been subjected is beyond comprehension."
"In his treatment of his victims the defendant sank to the most profound depths of depravity."
Jayne Ludlam, director of children's and young people's services at Sheffield City Council, said the abuse was revealed to social workers in June.
Ms Ludlam said: "This is one of the most harrowing cases we have had to deal with and to say we are shocked to find this level of abuse being perpetrated by this person is an understatement.
"Due to the seriousness of this case an independent review has already been launched which will look into the circumstances surrounding the case and the contact the agencies had with the victims."
Sheffield Crown Court was told that the father, who also pleaded guilty to four indecent assaults, "took pleasure" in knowing the harm he was doing to his daughters.
He refused to leave his prison cell to come to court to hear the sentencing.
The court heard that the sexual abuse started when the two sisters reached the age of eight but that they only realised the other was being abused when they became pregnant some years later.
The father moved the family from village to village in rural locations to keep them isolated.
The court heard that on a number of occasions doctors advised the women to stop having children by the same father.
On one occasion a doctor asked one of the women whether her father was also the father of her child. She flatly denied the accusation.
Nicholas Campbell QC said: "The defendant played Russian roulette as to whether there would be complications in the pregnancies and with the health of his daughters."
Their father, who cannot be named for legal reasons, threatened them with a "real hiding" if they refused to have sex with him.
Mr Campbell said: "All the defendant's children spoke of his domination over their family life. He was tall and strongly built."
"All the family were frightened of him. When they heard his car pulling up outside the house, the children and their mother ran to their respective rooms.
"His younger daughter told of the frightening habit her father had of putting her head next to the flames of their gas fire and that when she struggled to get away on certain occasions she burnt her eyes."
On one occasion, the women called Childline and asked for a guarantee that they could keep their children, but when one was not offered they ended the call.
Mr Campbell said: "When either one of his victims tried to end the sexual abuse, he threatened to kill them and their children, and when they threatened to tell police, he said they would not be believed.
"He said that if they went public then the children would be taken away from them.
"All the time, when the sisters were challenged about the paternity of their children, they would cover it up.
"They started taking the pill. He said they should not be taking it and, just as they felt unable to avoid his sexual abuse, they obeyed.
"They spoke of his pleasure at fathering their children whilst at the same time they had fears for the welfare of these children and how they would cope."
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