The Reedley Police Department says a 17-year-old boy has been arrested on four counts of homicide.
Officials say the teen's mother, 34-year-old Brynn Curtis, and her boyfriend, 21-year-old Rafael Gonzalez, have also been arrested on charges of accessory after the fact.
The arrests come after investigators say 81-year-old Billy Bonds, 44-year-old Guadalupe Bonds, and a third person were found dead at a home on Saturday morning.
RELATED: 4th body discovered at home next to Reedley homicide scene, police say
On Tuesday, police found a fourth body during a search of the home next door to where the three victims were found.
Officers also served search warrants at a Parlier home and another house in Selma, where they impounded two vehicles.
Police have been searching for Matthew Bonds, who is Guadalupe's husband.
They have not yet confirmed if the body found Tuesday morning could be his.
Stay with Action News for the latest updates on this developing story.