Yvonne Ervin was eventually able to call 911, and Gwinnett County police arrived to arrest her sons.
Christopher and Cameron Ervin.(Credit: Gwinnett County Sheriff s Office)
A possible motive for the attack has remained unclear. Less than a month afterward, however, Yvonne and Zach Ervin appeared on "Good Morning America" and called the incident "one bad moment."
On Jan. 2, Yvonne Ervin wrote a letter to a Gwinnett County judge asking for her sons to be released from jail.
Nine days later, "Fighting for Forgiveness" — which is "committed to assisting those who are experiencing depression, thoughts of suicide and trauma by giving them access to counseling, peer mentorship and medical attention," according to its website — became a legal entity.
The nonprofit's website suggests one of the Ervin brothers battled with such issues, but little more is known about the organization or its specific inspiration.
Online court records show that, in April, a judge issued an order for a psychological evaluation for Cameron Ervin.
Multiple attempts to contact Zach and Yvonne Ervin for this article were unsuccessful. The attorneys representing their children also did not respond to inquiries, and a family friend said the couple wasn't inclined to speak to a reporter.
The foundation will hold a "program kick-off and cook out" from 2 to 4 p.m. Sunday at Snellville's Lenora Park.
"The vision of 'Fighting For Forgiveness' was given to our son," its website says, "and we are committed to carrying it forward."