This is the putrid motel room where two teenage sisters pimped out vulnerable and homeless girls aged as young as 12 to have sex with 'fat old men'.

Surrounded by graffiti, soiled and broken furniture, police said the sisters - aged 16 and 19 when they began the child prostitution ring - rented rooms at the Grandstand Motel in Sydney's south west, for their makeshift brothel.

The two girls have both been jailed over the child sex ring they ran for several years before they were arrested in 2012.

Both girls had severe intellectual disabilities and IQs in the lowest one percent of the population. The younger sister was jailed for a minimum four years and her sibling a minimum of six.

Two teenage sisters recruited vulnerable homeless girls into a child prostitution ring and made them have sex with 'fat old men' in carparks and grotty motels. Pictured: Police take the sisters into custody

This is the squalid room inside the Grandstand Motel at Warwick Farm, in western Sydney, that the two sisters rented (pictured) so the homeless girls could have sex with 'fat old men'

The rundown rooms were covered in dirt and grime (pictured). Daily Mail Australia it is not suggesting that the motel owners or staff knew of or were involved in the ring

The Grandstand Motel (pictured) was one of the regular haunts used by the sisters for their sex ring

Daily Mail Australia it is not suggesting that the motel owners or staff knew of or were involved in the ring.

Using social media platforms such as Facebook, the two sisters would rope girls into joining the sex ring on the promise of shelter and drugs like ice.

After luring them in the sisters would take them to the Warwick Farm motel, carparks or housing commission units to meet with the men, The Daily Telegraph reports.

The young girls were told to wear heavy make up to appear older to the men.

Some of the girls were pimped out for the price of a pack of nappies needed for one of the sister's children.

The pimps threatened to kick them to the streets if they stopped working.

One 13-year-old who had sex with three men in three days told NSW District Court: 'I was so alone. I still live in fear of being kicked out into the streets, having nowhere to go and no one to love me.'

Surrounded by graffiti, soiled and broken furniture, police said the sisters, were aged 16 and 19 at the time they began the child prostitution ring

The sibling pimps were brought up by their grandmother because their mother, who was addicted to heroin, spent most of their lives in jail

After luring them in the sisters would take them to the Grandstand Motel, carparks or housing commission units to meet with the men

Through Facebook or mutual friends, the pimps lured seven vulnerable girls aged 12 to 16 with the promise of shelter and drugs such as ice. Pictured: One of the sisters is taken in

Sick: Father of six Bassam Darwich, 57, was convicted of using the child prostitutes

Three men were convicted of using the child prostitutes: Rino Mura, 58, Bassam Darwich, 57, and Trevor Weger, 56.

One of Darwhich's victims 'lay there crying ... placing the pillow over her face until the sex had finished'. The crane operator was jailed for three years and six months.

Weger was jailed for three years and accountant Mura will be sentenced on Friday.

The brothel was discovered when Mura called police after he was robbed at gunpoint in February 2012.

Detectives felt something more sinister was going on and decided to investigate further.

They found out Mura was with a 13-year-old prostitute who had been advertised as 'very pretty, size 10, big boobs, black hair' when he was robbed in a set up by the teenage sisters.

The sibling pimps were brought up by their grandmother because their mother, who was addicted to heroin, spent most of their lives in jail.

The oldest sister, who has three children in care, was jailed after pleading guilty to 21 counts of child prostitution.

Judge Martin Blackmore said: 'Children are entitled to the protection of the law even when they are not protecting themselves.'