Three urns bearing the childrens' remains were carried slowly to their final resting place.
A brief graveside service evoked tears and sorrow from family members. The headstone listed only their names:
Marnie R. Warren Brandon K. Warren Bradley K. Warren
The remains were buried together.
Robert Holsclaw did not know the family, but said that he felt compelled to attend the funeral.
"I come down to show my respect and bring a little gift. My love goes out to them. It's a tragedy. I feel sorry for them. I wish there's something we could do for them," said Holsclaw.
The teens were found shot to death in their Johnston County home. Investigators have ruled the shooting a murder/suicide, concluding that one of the teenage boys shot his older sister and brother, and then turned the gun on himself.
Authorities said that Marnie Warren, 19, had been shot four times in the head and her half-brother, 13-year-old Bradley Warren, had been shot 11 times in the head, face, chest, arm and back.
The third child, 14-year-old Brandon Warren, was shot one time, with a self-inflicted gunshot wound to the roof of his mouth. Authorities found a .22 caliber semi-automatic rifle near the body of Brandon Warren.
The ordeal is not yet over for the Warren family. Johnston County investigators plan to meet with the District Attorney on Monday. The parents, Kent and Nissa Warren, could face charges of child neglect or failure to secure a firearm.