Rob Reiner and Michele Singer Reiner were cautioned against having their adult son Nick living in their home shortly before authorities say he killed his parents in cold blood, according to a new report.

The 32-year-old middle child of the late couple — who also shared son Jake, 34, and 28-year-old daughter Romy — pleaded not guilty last month to two counts of first degree murder in the Dec. 14 deaths of the “When Harry Met Sally” director, 78, and 70-year-old photographer.

“The medical staff warned Rob and Michele not to let Nick live at home until he got his medication straightened out,” a source told Us Weekly.

In addition to battling substance abuse since his teenage years, Nick, who was staying in his parents’ guest house at the time of the killings, was in a mental health conservatorship from 2020 to 2021. He’s reportedly been diagnosed with schizophrenia or schizoaffective disorder. Two sources with direct knowledge told TMZ in the days after the killings that doctors were trying to stabilize Nick, who had grown “erratic and dangerous” following a change in medication.

If convicted, Nick faces life in prison without the possibility of parole. The death penalty has not yet been taken off the table.

He is scheduled to appear in court on April 29.