Denise Reese and Mary Shea died during the War against the Machines. The couple used to tell their son about the life before Judgment Day.
T2 Trilogy timeline
Dennis Reese emerged as resistance fighter and leader in Missouri. Eventually, he and a nurse named Mary Shea became the parents of Kyle Reese.
Dennis was commander-in-chief of the Ozark Redoubt. His son Kyle and wife Mary were captured by Luddite Patrol A-36 under the command of Sam Marshall and delivered to a Death camp to serve as slaves. Ironically, his grandson John Connor led an assault against the Luddite extermination camp three years later. Although they are almost rescued by Connor and other Tech-Com soldiers, Dennis and his wife Mary were killed by a Terminator during the assault on the camp.
Terminator Salvation timeline
Terminator Genisys timeline
Mr. Reese is alive in an alternate timeline created by the attempted assassination of Sarah Connor, where he and his wife and young Kyle were called to the police station. The Reese family were asked if they knew the man, the older Kyle, inside the interrogation room. None of them knew him, just feeling the man looks familiar. His wife said the man looked much like him. After a while, when the police station was attacked by the T-3000, Sarah helped the family to evacuate from the scene.
- During Kyle's childhood as shown in Terminator: Revolution issue 4, there was a man taught him how to hunt with a sniper riffle. It is unknown whether the man who taught Kyle to hunt is his father or not since he called Kyle "Reese" instead of his first name, unless this is merely an error.
- T2: The Future War (First appearance)