Southern Charm's Thomas Ravenel has renewed his bid for sole custody of his children as their infamously volatile mother continues to stall on court-ordered drug tests.

Court documents seen exclusively by DailyMail.com show that Kathryn Dennis has been evading the mandated drugs and alcohol tests since last November and now risks being held in contempt.

In addition, just last week, Kathryn lost her bid to keep her medical and mental health records out of the custody battle as the court ordered her to hand over all records since January 2013, including those relating to a stint in rehab last summer.

The 24-year-old checked into a Malibu facility after drug tests last June found that she had amphetamine, marijuana, crack and/or cocaine and methadone in her system.

Southern Charm's Thomas Ravenel has renewed his bid for sole custody of his children as their infamously volatile mother Kathryn Dennis continues to stall on court-ordered drug tests

Court documents seen exclusively by DailyMail.com show that mother-of-two Kathryn Dennis has been evading the mandated drugs and alcohol tests since last November and now risks being held in contempt

'Why won't she take the drugs test?' Ravenel asks in a new trailer for the premiere, before providing the answer. 'Because she knows she'll fail'

Season 4 of the hit Bravo show premieres tonight and in the trailer Ravenel, 53, is shown voicing his frustration at Kathryn's continued refusal to fulfill the condition of her already limited visitation rights with three-year-old Kensington, known as Kensie, and one-year-old St Julian Rembert, aka Saint.

'Why won't she take the drugs test?' he asks, before providing the answer. 'Because she knows she'll fail.'

In another trailer for the premier, Kathryn makes a surprise call to her friend Craig Conover, announcing that she's back in Charleston.

'I haven’t talked to Kathryn in months. But I mean, look, Kathryn has some issues, she’s dealing with some s*** right now. Last I heard she was out in California, a rehab center somewhere,' Conover said.

'I’m really, really glad to hear Kathryn's done so well, but I’ll be honest: my life’s a lot easier without Kathryn in it because when she’s in it, things get complicated really, really quick.'

Season 4 of the hit Bravo show premieres tonight and in the trailer Ravenel, 53, is shown voicing his frustration at Kathryn's continued refusal to fulfill the condition of her already limited visitation rights with three-year-old Kensington, or Kensie, and one-year-old St Julian Rembert, aka Saint

Now court records seen by DailyMail.com seem to back up Ravenel's assertion about drug addiction and reveal that Kathryn has been stalling for close to five months, failed to show at a court appearance last December and has been threatened with jail - should she persist in her refusal to take the test.

Her own attorneys' attempts to contact Kathryn on the day of her no-show and give her an opportunity to appear proved futile.

The judge concluded that Kathryn 'has been evading the drug and alcohol testing required' and instructed her to 'submit to immediate drug and alcohol testing or to report to the Charleston County Detention Center or the Berkeley County Detention Center.'

Clearly frustrated, he noted that Kathryn had repeatedly failed to provide medical records and ruled that, as Kathryn herself had 'introduced her mental condition as a claim or defense…that she is a fit and proper parent to have custody of the minor children,' she waived any right to privilege and gave the court 'good cause' to require the release of 'any and all of her mental health records.'

It was also ruled that Kathryn should pay Ravenel's legal fees in relation to these motions as she 'has been uncooperative and her behavior has caused the Plaintiff's attorney's fees to mount.'

The court records, and the new season’s dramatic trailer which shows a tearful Kathryn, reluctantly handing over her daughter to Ravenel, certainly paint a very different picture from the one Kathryn is keen to portray herself.

In an interview with ET on the eve of the season 4 premier Kathryn studiously failed to mention the ongoing court battle and instead claimed, ‘I’m really at peace with everything. Chaos is out of my life, luckily. And, I have two beautiful babies. What else could you really wish for?’

Referring to her 31 day stint in rehab last summer she spoke out against what she described as the ‘stigma’ relating to what she went through and said, “What I went through wasn’t just addressing drugs, alcohol, whatever. It was more beneficial in, like, life skills. Honestly, in a way I feel like everyone should go to some type of rehab.’

She insisted that the experience had been key in ‘resolving’ her own issues and that she thinks people will be surprised at how ‘easy going and normal,’ she can be.

But what she has described as a ‘metamorphosis’ has so far failed to manifest in the courtroom where no resolution has been reached.

The latest filings coincide with Ravenel's return to Charleston with the children following a couple of months in La Quinta, California for the winter polo season.

In a post on instagram, on which Ravenel proudly bills himself as 'Father,' show him doting on his children. Just last week he posted images of Kensie celebrating her third birthday on the West Coast with balloons and a cupcake.

Meanwhile, two thousand miles away, Kathryn posted a throwback picture of herself holding her then-infant daughter, with the words: 'Cue the tears. My Daughter, my Angel, my Kensington Calhoun Ravenel is 3 years old today.'

There was no sign of Dennis at the family home in Charleston when DailyMail.com visited last week and her father, Luke, declined to comment on the current legal battle being waged between his daughter and her former lover, Ravenel - beyond describing the situation as 'difficult.'

Ravenel with one-year-old son St Julian Rembert who is called Saint.

A damning affidavit from the children's nanny accuses Kathryn of prioritizing her social life over her children. 'Kathryn seemed to look at her children as if they were toys or props and not real children, with real needs,' she said

Even by the standards of reality television, Ravenel and Dennis's relationship has been one of torrid drama as viewers have tuned in season after season, riveted by the compelling implosion.

But court records seen by DailyMail.com paint a far darker reality than the version served up for public consumption on Bravo TV's popular show, charting Kathryn's struggle with drugs and alcohol and including disturbing allegations of neglect and abuse.

Ravenel reluctantly filed the suit against Kathryn towards the end of last May. It was not a decision he made lightly as, according to his affidavit, he tried to make the relationship work for the sake of their children but simply could not.

He testified: 'I tried to make our relationship work…but Kathryn was too unhealthy. When she wanted to control me she would hide or take either my cell phone, wallet, or car keys.

'If I tried to get them back, she would accuse me of hitting her.

'I have never laid a hand on her. In fact, social media posted a video of Kathryn assaulting me in New York.'

But despite all of this, Ravenel revealed he went so far as to buy an engagement ring with the intention of asking Kathryn to marry him.

He said: 'After KCR [Kensington Calhoun Ravenel] was born I considered marrying Kathryn. We went and looked for an engagement ring.

'The very evening after I had ordered her ring, Kathryn left me with KCR at home saying she was going to run errands.

'She said she would be back by 7.00pm. She did not return back home until after 1am.'

A similarly damning affidavit from the children's nanny accuses Kathryn of prioritizing her social life over her children.

Nanny Deidre Blair Politelli revealed how she once found a 'bong or handmade smoking device' in Kathryn's home when doing laundry and said: 'Night after night Kathryn would leave to go out…Most of these nights Kathryn would return between 1am and 5am...Typically she got up between 12.30pm and 3pm in the afternoon.'

'She appeared to not know the difference between her reality and TV reality. This led to constant panic attacks, personal attacks, and creating things in her mind that did not happen,' the nanny Deidre Blair Politelli said

According to Mrs Politelli: 'Kathryn's lifestyle significantly interfered with her ability to care for and be engaged in the daily lives of her children'

According to Mrs Politelli: 'Kathryn's lifestyle significantly interfered with her ability to care for and be engaged in the daily lives of her children.'

In a troubling observation, she added: 'Kathryn seemed to look at her children as if they were toys or props and not real children, with real needs.

'She appeared to not know the difference between her reality and TV reality. This led to constant panic attacks, personal attacks, and creating things in her mind that did not happen.

'The children have been consistently returned to Thomas's house reeking of cigarette smoke, unbathed, in dirty clothes, with matted hair.

'On more than one occasion I have picked SJR (St Julian Rembert) up from Kathryn's with such matted hair, from it not being brushed or combed, that I was forced to cut the knots out of his hair.'

Mrs Politelli's daughter, Paige, 19, testified that Kathryn told her she 'drank red wine and took Adderall all during her pregnancy.'

According to Ravenel, he was forced to accept that 'our children are not safe when they are with Kathryn.

'She is more interested in partying than mothering, I believe she is addicted to drugs and cannot function in a manner conducive to her having caretaking responsibilities for our children.'

Ravenel made this statement prior to Kathryn's stint in rehab last summer and following that stay, in September Kathryn was granted supervised visitation with her children every other weekend.

But now with her continued evasion of the latest drugs test, Kathryn has placed even this in jeopardy.