An elderly couple were driving their 20-year-old great-grandson to a friend's house in Texas, where he was to stay until he got evaluated for what his great-grandma called "behavioral issues." As she told Lucian Johnston that on the car ride over Sunday, explaining he could no longer live with them due to his behavior, a police report says the 20-year-old became enraged and started stabbing both her and her husband with a knife. That's when his 12-year-old half-brother stepped in, NBC News reports: The boy, whom Harris County Sheriff Ed Gonzalez calls a "real hero," managed to grab the knife from Johnston and throw it out the car window, per authorities. Gonzalez says the boy likely saved his great-grandparents' lives.
The great-grandma, 92, and great-grandpa, 76, were treated for stabbing injuries to the neck and head, but both have been released. Meanwhile, Johnston allegedly fled the scene, but he was arrested Monday when he returned to the home of the friend where he was originally being dropped off. He's charged with two counts of aggravated assault with a deadly weapon. The great-grandfather told authorities he believes he and his wife would have been killed if not for the 12-year-old. "What I did was I grabbed him from behind. I pulled him backwards trying to get him away from Grandma," the boy, who gives his name only as Sacha, tells ABC13. "But I did grab the knife. I held that to his neck also. He bent back my finger, which is still sore right now. He head-butted me, which I have a loose tooth from that, but I do not really care." (Read more Texas stories.)