Illinois State Police identified the victims Thursday as 1-year-old Brantley Ralston and 5-year-old Nolan Ralston.
Their slain parents are 29-year-old James Roy Ralston and 23-year-old Brittney Luark, who was also pregnant.
The fifth victim is Luark’s grandmother and great grandmother of the boys, 67-year-old Jo Ann Sinclair.
The bodies were discovered Wednesday inside a home in Manchester, located about 50 miles west of Springfield.
A short time later the suspect in the shootings was killed in a gun battle with police.