Nick Reiner Prosecutor Says Siblings Want Grand Jury Transcript Sealed

Nick Reiner won't face the death penalty in his criminal case ... and it seems the public won't be clued in on certain details of the case -- because the Los Angeles County District Attorney says his siblings don't want grand jury testimony released to the public.

Los Angeles D.A. Nathan Hochman spoke to the assembled media outside the Foltz Criminal Justice Center in Downtown Los Angeles Tuesday morning ... confirming our report that his office won't pursue the death penalty.

D.A. Hochman noted his office thoroughly reviewed the case, listened to Nick's siblings Jake and Romy Reiner's desires ... and decided that life without the possibility of parole -- the other max sentence for Nick -- is sufficient.

Jake and Romy aren't aligned with him and didn't pony up for his defense ... but we're told they would have a hard time during potential sentencing if execution were on the table.

It seems Jake and Romy have been very involved with the prosecution in the months since Rob and Michele's deaths ... because D.A. Hochman also says the two siblings don't want grand jury testimony released -- feeling it will cause them more trauma for the details to be made available to the public.

Nick is charged with murder in the first degree with special circumstances -- lying in wait -- after allegedly murdering his parents last year at their L.A. home.

Nick is due in court later today.