If convicted, Nick faces life imprisonment without parole or the death penalty.
His siblings, Romy Reiner, 28, and Jake Reiner, 34, have not attended court hearings since the incident.
Jamie said: “Rob and Michelle are her godparents.”
She added: “My beautiful daughter who loved [the Reiners] – as we all did – managed to be able to metabolise her grief and sadness, as we all have had to do.”
Jamie also described the events surrounding Annie giving birth to her first child the week after the deaths, saying it represented “life on life’s harshest terms and life on life’s most beautiful, perfect terms”.
Speaking previously to Variety, Jamie said: “Our ONLY focus and care right now is for their children and immediate families and we will offer all support possible to help them. We have lost great friends. Please give us time to grieve.”
She added: “[We’re] numb and sad and shocked about the violent, tragic deaths of [their] dear friends.”
Rob Reiner built a celebrated career as both an actor and director, gaining early fame in All in the Family before moving behind the camera.
He directed acclaimed films including When Harry Met Sally, Stand by Me and A Few Good Men. Known for his versatility across genres, Rob earned widespread critical and commercial success, with multiple award nominations.
His work helped define modern American cinema, balancing popular appeal with strong storytelling and memorable performances across decades of filmmaking.