THE House of Horrors parents were allegedly planning to have a 14th child in a desperate bid to land a reality TV show and become millionaires.
David Turpin, 57, and wife Louise, 49, believed "the world would be fascinated by their lives" and moved to California to be closer to Hollywood, the mum's brother claimed.
Billy Lambert alleges that his sister would joke about being bigger than US TV series Kate Plus 8, about reality star Kate Gosselin and her eight kids.
Speaking to the Sunday People, he claims Louise told him just last month that the couple were planning baby number 14.
Billy said said: “She used to say how they would be perfect for TV and would often mention they would be bigger than the reality show Kate Plus 8.
“It is the reason they moved to California to be nearer to Hollywood.
“They thought it would make them millions and household names."
The couple were this week charged with starving and torturing their 13 children, aged between two and 29-years-old, after one of them escaped the home in Perris, California.
Investigators said the siblings had been so malnourished that the older ones still looked like children and officers thought the escaped 17-year-old girl was just 10.
David Turpin was also charged with performing a lewd act on a child under age 14.
The pair pleaded not guilty to all charges but each faces 94 years to life in prison if convicted.
Prosecutors said the abuse of their children dated back years, to when the couple lived in Texas and appeared to intensify over time.
Riverside County District Attorney Mike Hestrin said they would tie up their children with ropes and at least one of the children had been hogtied but after that child escaped from the ropes, they started to use chains and padlocks.
Some of the children would be chained for weeks or months at a time and wouldn't be freed to use the bathroom, he said.
Their punishments included frequent beatings and strangulation, according to the district attorney.
The children were only allowed to shower once a year and if they washed their hands above their wrists, they would be accused of playing in the water and would be chained up, he said.
When they weren't allegedly chained up, the siblings were locked in different rooms in the house and "fed very little on a schedule".
Billy said he last spoke to sister Louise on January 10 and up until their arrest he thought the couple were living the perfect life.
He explained how David had a good job in the aeroplane industry in Texas and worked on Air Force One when Bill Clinton was president.
Billy believed the family were moving to California for David's job but in reality he wasn't working.
The last time Billy saw his nephews and nieces was in 2002 and claims every time he tried to visit them his sister would make excuses, such as it being too expensive to take them all on the plane.
When technology advanced and the family began to Skype, he says would ask to see the children but Louise would claim the "computer was broke" or the "camera isn't working".
He said his sister had also told him they were living in a huge seven bedroomed three-storey house in California but was shocked to discover this week that the family of 15, plus their two dogs, were squeezed into a single storey home.
Billy, who has a one-year-old daughter and a nine-month-old son, now wants to apply to adopt the three youngest children.
He said their sister Teresa has also offered to take some of them in too.
The seven adults and six children are currently being cared for in hospital and experts say they will likely need years of therapy, adding that it's best to keep them together.
Abbey Kanzer, a clinical psychologist at the Center for Victims of Torture in St. Paul, Minnesota, said recovery can take years but there is hope in even the most horrific cases.
She said: "The hope for treatment is to find a way so the trauma becomes a contained part of what happened to them. It becomes part of their story, but not their complete story."
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