The shocking 911 call made by one of the California house of horrors children that led to 13 siblings being rescued has emerged just one day before the parents are due to be sentenced.

David Turpin, 57, and his wife Louise, 50, will be sentenced to at least 25 years in prison on Friday after pleading guilty to abusing and imprisoning their children in their home.

They were arrested in January 2018 after their 17-year-old daughter Jordan managed to escape from the home and call 911 to report that her parents were abusive and some of her siblings were chained to their beds.

The chilling 911 call audio, obtained by ABC News on Thursday, lasted for 20-minutes as the daughter told the dispatcher of the abuse and struggled to work out her address because she had not been outside alone before.

David Turpin, 57, and his wife Louise, 50, will be sentenced to at least 25 years in prison on Friday after pleading guilty to abusing and imprisoning their 13 children in their home

'Okay, I live in a family of 15 people and my parents are abusive. They abuse us and my two little sisters right now are chained up. There's 13 kids and then a mother and a father,' she said in the 911 audio.

She went on to reveal that two of her sisters and one of her brothers were tied to their beds with chains.

When asked for details about her location, the girl said: 'I've never been out. I don't go out much so I don't know anything about the streets or anything.'

The dispatcher then asked if anyone in the house would need to go to the hospital.

'I'm not sure. Sometimes we live in filth and sometimes I wake up and I can't breathe because because how dirty the house is,' she said.

The dispatcher responded: 'When was the last time you had a bath?'

'I don't know, almost a year ago. But sometimes I feel so dirty, I wash my face and I wash my hair,' the girl said.

After the dispatcher asked if anybody took medication at the house, the girl replied: 'Oh I don't know what medication is.'

The couple pleased guilty to abusing and imprisoning their children in their home. They are due to be sentenced on Friday to at least 25 years each in prison

They were arrested in January 2018 after their 17-year-old daughter Jordan escaped from the home and called 911 to report that her siblings were chained to the bed. She's pictured above in a YouTube video of herself singing that she managed to upload to YouTube

The teenager managed to escape from the family's home in January last year and call 911 to report the abuse from their parents

The 17-year-old also told the dispatcher that she and her siblings didn't attend school.

'We don't do school. Our mother tells people we're home schooled... she has a fake private school set up but we don't really do school,' she said.

'I haven't finished first grade and I'm 17.

'I don't know much about my mother. She doesn't like us. She doesn't spend time with us ever.'

Sheriff's deputies eventually met the 17-year-old girl 20 minutes after she called 911 and discovered a house of horrors.

Officers found the children, who ranged in age from two to 29 at the time, were severely underweight. They had stunted growth and hadn't bathed for months.

The children told officers they had been starved and put in cages.

The Turpins had led a mostly solitary, but seemingly unremarkable life until the teenager jumped from a window and called for help in 2018.

David had worked as an engineer for both Lockheed Martin and Northrop Grumman, while his wife Louise was listed as a housewife in a 2011 bankruptcy filing.

The family led a nocturnal existence, which kept them largely out of sight from neighbors in a middle-class subdivision.

The 17-year-old also told the dispatcher that she and her siblings didn't attend school and that they hadn't had a bath in over a year

David Turpin, 57, and his wife Louise, 50, were arrested in January 2018 after their 17-year-old daughter managed to escape from the home and call 911

Children were deprived of food and things other kids take for granted, such as toys and games, and allowed to do little except write in journals.

Some children suffered from severe malnutrition, stunted growth and muscle wasting, including an 11-year-old girl who had arms the size of an infant.

The kids were rarely allowed outside but went out on Halloween and traveled as a family to Disneyland and Las Vegas. They spent most of their time locked in their rooms except for limited meals or using the bathroom.

All the children were hospitalized immediately after they were discovered and have not spoken publicly. Riverside County authorities then obtained temporary conservatorship over the adults.

The social services agency tasked with overseeing the younger children declined to comment on their cases.

The adult children are all living together, attending school and getting healthy while leading lives similar to their peers, said Jack Osborn, an attorney who represents the seven adult children. He said they value their privacy.

'They are relieved they can now move forward with their lives and not have the specter of a trial hanging over their heads and all the stress that would have caused,' Osborn said.