I live with a son who is mentally ill. I love my son. But he terrifies me.

A few weeks ago, Michael pulled a knife and threatened to kill me and then himself after I asked him to return his overdue library books. His 7 and 9 year old siblings knew the safety plan—they ran to the car and locked the doors before I even asked them to. I managed to get the knife from Michael, then methodically collected all the sharp objects in the house into a single Tupperware container that now travels with me. Through it all, he continued to scream insults at me and threaten to kill or hurt me.

That conflict ended with three burly police officers and a paramedic wrestling my son onto a gurney for an expensive ambulance ride to the local emergency room. The mental hospital didn’t have any beds that day, and Michael calmed down nicely in the ER, so they sent us home with a prescription for Zyprexa and a follow-up visit with a local pediatric psychiatrist…

I am sharing this story because I am Adam Lanza’s mother. I am Dylan Klebold’s and Eric Harris’s mother. I am Jason Holmes’s mother. I am Jared Loughner’s mother. I am Seung-Hui Cho’s mother. And these boys—and their mothers—need help. In the wake of another horrific national tragedy, it’s easy to talk about guns. But it’s time to talk about mental illness.