A black man has been arrested for stabbing his 76-year-old grandmother to death and killing his father before hiding their bodies and throwing a house party

Dwayne Flourney, 26, stabbed Sandra Flourney repeatedly before stuffing her body in the trunk of a car parked in the family's garage. He then waited for his father Brian, 52, to return from work, killed him in the same way and put his body in a chair on the back porch covered with tarp, police said.