Inside Rob Reiner’s son Nick’s ‘hostile’ dynamic with siblings Romy and Jake

Rob Reiner and Michele Reiner’s son Nick had a “hostile” dynamic with his siblings, according to a new report.

The 32-year-old, who has been arrested for his parents’ murders, allegedly “always” had a “volatile” relationship with all of his family members, including brother Jake and sister Romy, a source told Us Weekly.

The outlet noted on Monday that Romy, in particular, “has been so traumatized by Nick’s behavior” over the years.

“She has always been so close with her parents, and watching their constant pain over Nick has impacted her and the whole family so much,” the insider explained.

“It’s been so much of their life,” the source added. “Rob and Michele were honest about their struggles with Nick, and those who spent time with the family saw it firsthand.”

Nick’s “anger was directed at his parents for many, many years,” according to the outlet.

“They did everything a parent could possibly do to help him,” the insider alleged. “Even in his younger years, they really tried to get him help. And then it became a cycle of seeking treatment for him, kicking him out, or him leaving the house, him moving back in.”

Page Six similarly reported Monday that Nick, who has battled drug addiction for more than half his life, was “egocentric” with “serious behavioral issues” from a young age.

Yoga instructor Alanna Zabel told us that when she worked with Rob and Michelle in the early 2000s, Nick “interrupted pretty much all of [their] yoga sessions” for “20 minutes or so” with “intense … screaming.”

She insisted the late couple tackled their son’s issues “head-on” at the time.

Another insider told us that Nick “really resented his dad” and “hated himself for not being as talented, prolific or beloved.”

Rob and Michele were found stabbed to death in their Brentwood, Calif., home by Romy over the weekend, hours after attending Conan O’Brien’s Christmas party.

At the holiday bash, the duo reportedly got into a “very loud argument” with Nick and left.

On Monday, People reported that Nick had been “freaking everybody out” at the event by “acting crazy” and “asking people if they were famous.”

Nick was taken into custody on Sunday and is currently on suicide watch at Twin Towers Correctional Facility in Los Angeles, where he is being held without bail.

While Romy and Jake have yet to speak out individually about the tragedy, Rob and Michele’s “heartbroken” family did issue a statement expressing “deep sorrow.”

Additionally, Rob’s eldest daughter Tracy from his first marriage told NBC News how “shock[ed]” she was by the news.

The 61-year-old said, “I came from the greatest family ever. I don’t know what to say.”