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Warrant: Brothers accused of trying to kill parents had been planning for years

Christopher Ervin (left) and his brother Cameron are accused of viciously beating their parents and attempting to burn down their home.

CBS affiliate WGCL

GWINNETT COUNTY, Ga. -- New information about two brothers who are accused of trying to kill their parents at their Georgia home alleges that they had been plotting the murder for a long time, reports CBS affiliate WSBTV.

Police said Yvonne Ervin called 911 at 7:49 a.m. Sept. 5 and told emergency dispatchers that her sons Cameron, 17, and Christopher Ervin, 22, were trying to kill her and her husband, Zachary Ervin.

According to the station, a detective wrote in the search warrant affidavit,"One of the sons also stated that he had been planning this since he was eleven years old."

The parents told police "their sons used plastic wrap and plastic bags to try to asphyxiate them" and gave them drugs in cocktails the night before, reports the station.

Chris and Cameron Ervin allegedly tried to blow up their Forbes Trail home earlier this month and, when that didn't work, they attacked their parents, says the station. Both survived the attack.

Police also believe the sons tried to burn their parents, according to the station. Police say Yvonne Ervin told them that "during the attack the sons poured an unknown substance on her and then she felt heat on the back of her leg and she believed this was an attempt to set her on fire."

The brothers remain held in jail without bond.