Nick Reiner with parents Rob and Michele Reiner
@michelereiner/Instagram

Romy Reiner's sanity is feared to be 'hanging by a thread' after she stumbled upon the lifeless body of her movie icon father, Rob Reiner, in a scene of unimaginable horror. The devoted 28-year-old daughter of the When Harry Met Sally... director was reportedly the first to arrive at the bloodbath inside her parents' Brentwood mansion, a grim discovery that has left her 'astonishingly fragile'.

Sources close to the family revealed that Romy made the harrowing journey to the property after the couple's massage therapist was unable to reach them on Dec. 14. Upon entering the home, she found her 78-year-old father and 68-year-old mother, Michele Reiner, with their throats slit as they lay in bed — a nightmare scenario that has reportedly left her 'beyond raw'.

Romy Reiner 'Gone to Pieces' Following Rob Reiner Murder

Since the shocking arrest of her brother, Nick Reiner, 32, who has been charged with the double murder, insiders say Romy has completely 'gone to pieces'. The trauma of witnessing the aftermath of the violence inflicted on Rob Reiner and his wife is said to have destabilised her to a worrying degree.

'Her sanity is truly hanging by a thread,' a source claimed. 'A scene like that would test even the most hardened cop or paramedic, but for someone like Romy, who has seen nothing of that side of life, it is horrifying and totally destabilising for her mind.'

The insider added the chilling context that makes her grief so complex: 'Add in the horrifying fact that it was her parents' bodies, and she is now teetering on the brink.' Friends and family are reportedly deeply concerned that the memories of what she witnessed inside the home of Rob Reiner will haunt her for years to come. 'Her family is really worried she won't be able to cope long-term with the memories of what she witnessed,' the source continued, highlighting the severity of her psychological shock.

Son Jake Steps Up Amidst the Rob Reiner Tragedy

While Romy battles her trauma, her older brother Jake Reiner, 34, has reportedly emerged as a 'pillar of strength' for the shattered family. Insiders say Jake has had to suppress his own grief to support his sister, embodying the values Rob Reiner and Michele instilled in their children.

'Jake has really had to take on a fatherly role,' one source explained. 'He lives by the principle of "family first," which is exactly what Rob and Michele taught their children when they were alive.'

Jake, a graduate of Syracuse University, has built a multifaceted career in journalism, presenting, and acting, following in the footsteps of his famous father. In a twist of cruel irony, Jake recently appeared in Netflix's Monsters: The Erik and Lyle Menendez Story, portraying a reporter covering the murder of parents by their children.

Some suggest this professional experience, though horrifyingly coincidental, may have given him a unique perspective to navigate the current tragedy surrounding the death of Rob Reiner. In stark contrast to Jake's stability, Nick Reiner had struggled for years with addiction and severe mental health battles.

He is believed to have been fighting schizophrenia in the lead-up to the murders and had reportedly clashed with his parents at a party hosted by comedian Conan O'Brien just the night before, on Dec. 13.

In a heartbreaking joint statement, Jake and Romy addressed the loss of Rob Reiner and Michele: 'Words cannot even begin to describe the unimaginable pain we are experiencing every moment of the day.' 'The horrific and devastating loss of our parents, Rob and Michele Reiner, is something that no one should ever experience. They weren't just our parents; they were our best friends.'

Before the tragedy struck, Romy's Instagram feed was a testament to her close bond with her father, filled with warm images of the duo. One particularly poignant photo — believed to be the last snap of the director — shows Rob Reiner enjoying a swim in the sea with his daughter during a sun-soaked break, a final memory of happier times before the darkness descended.