A West Yorkshire man who fathered a child by his own 13-year-old daughter has been jailed for abusing the youngster and her two sisters.
The teenager gave birth last summer, prompting a police inquiry into the paternity of the baby.
A court heard on Monday that DNA tests were carried out and established that her own 50-year-old father was also the father of her baby.
The man, who has lived at addresses in Dewsbury and Bradford, pleaded guilty to a charge of sexual activity with a child family member in relation to the 13-year-old.
He also admitted raping his two other daughters.
Prosecutor Matthew Bean told Bradford Crown Court that one of the other daughters also became pregnant, but she lost the baby when she suffered a miscarriage.
"She believes that her father was the father of that child," said Mr Bean.
The court heard that the man, who cannot be named to protect the identities of his children, began raping his eldest daughter while they
were living at a house in Dewsbury.
Mr Bean described how on one occasion, the father raped the girl in his car while he was taking her to school.
The man raped her again while they were living in Bradford, before he also began abusing his youngest daughter.
He raped that child after going into her bedroom while she was playing on a computer games console, the court was told.
The man had been due to stand trial yesterday, but when the charges were formally put to him for the first time, he admitted raping two of the girls.
He also pleaded guilty to the allegation of sexual activity in relation to the daughter who gave birth.
Jailing the defendant for 12 years, Judge Jonathan Durham Hall QC said the man's guilty pleas had spared his daughters the further appalling trauma of giving evidence in court.
"You have pleaded guilty knowing that the court must impose a significant and condine sentence," the judge told him.
"Most if not all of the aggravating features are here present. Significant breach of trust. Abuse of all your female children all of whom are particularly vulnerable."
Judge Durham Hall also imposed an indefinite sexual offences prevention order on the defendant and said he would be required to register as a
sex offender for the remainder of his life.