The decision over Lyle's future is a separate matter. He is set to appear before a different parole board panel on Friday morning. The brothers' conduct behind bars and before the 1989 killings is viewed differently, meaning that Lyle's case could prompt a different decision from the parole board.
During Thursday's hearing for Erik, a coalition of relatives, who have long advocated for the brothers' release, testified on Erik's behalf - saying he had changed.
His aunt Teresita Menendez-Baralt broke down in tears as she spoke before the panel, telling them she had forgiven Erik for killing her brother and the years of trauma he caused their family.
She said that she was dying from stage four cancer. "The truth is I do not know how much time I have left. If Erik is granted parole, it would be a blessing," she told them.
"I hope I live long enough to welcome him into my home, to sit at the same table, to wrap my arms around him - that would bring me immeasurable peace and joy."
During their trials, the brothers claimed the killings were done in self-defence and that they had suffered years of emotional and sexual abuse at the hands of their parents.
Prosecutors, though, argued they were greedy, entitled monsters who meticulously planned the killings then lied to authorities investigating the case while going on a $700,000 (£526,000) spending spree using money they had inherited.
The pair were not arrested until police got word of their admissions to a psychologist.
Three decades later, the case was re-examined in the public thanks to a mix of new evidence, attention on TikTok, a Netflix's drama series and input from celebrities.
But there was no movement in the courts until the Los Angeles' former top prosecutor re-examined the case and asked for a judge to re-sentence them, citing California's evolving approach to juvenile offenders and abuse survivors.
A change in state law allows offenders who were under the age of 26 at the time of their crime to be sentenced as minors rather than adults. Lyle was 21 and Erik was 18 when they killed their parents.
Despite the new LA District Attorney Nathan Hochman fighting against the resentencing effort, a judge in May changed their sentences to 50 years to life with the possibility of parole - which represented a reduction.