I have to wonder if mental illness (of the 18 year old) is the cause here?
http://www.cnn.com/2013/09/04/justice/colorado-teen-charged-mother-stabbed/index.html?hpt=ju_c2
http://www.cnn.com/2013/09/04/justice/colorado-teen-charged-mother-stabbed/index.html?hpt=ju_c2