The incident was reported at about 10:35 p.m. in the 1200 block of Ironwood Drive, where arriving officers found Benjamin Packer sitting in the driveway of a home, police said.
Inside the home, the officers located Dennis Packer suffering from multiple stab wounds. He was taken to Sutter Delta Medical Center in Antioch where he later succumbed to his injuries, according to police.
Benjamin Packer was taken into custody on suspicion of murder, police said.
Anyone with information about the incident is asked to call Brentwood police Detective Aguiar at (925) 634-6911.