Zach and Yvonne Ervin (via fightingforforgiveness.org)
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.
The parents have also launched a nonprofit foundation called "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.
"Fighting For Forgiveness, Inc. was founded as a result of a traumatic family event in September of 2015," the website says. "It gave us personal insight into the world of depression and how detrimental it can be when it goes undetected. God gave us the strength to forgive so that we could move forward with His plans for our lives."
In total, Cameron and Christopher Ervin are facing 13 felonies apiece.