Two kids in North Carolina used a gun to save their mother from her attacker (boyfriend) who was strangling her and threatening to cut her throat and kill everyone in the house. So a 12 and 15 year old got one of the boyfriends guns and the 15 year old shot him. He was a convicted felon with 2 protective orders against him by 2 other women. Multiple other guns were found in the house (his) and on his body.
http://www.foxnews.com/us/2018/08/16/north-carolina-kids-fatally-shoot-man-abusing-their-mother-police-say.html
http://www.foxnews.com/us/2018/08/16/north-carolina-kids-fatally-shoot-man-abusing-their-mother-police-say.html