I set up the camera to check on my baby during naptime, but what I heard shattered me first: my mother snarling, “You live off my son and still dare to say you’re tired?” Then, right beside my child’s crib, she grabbed my wife by the hair.

The day I set up the camera to keep an eye on my baby during his afternoon naps, I believed I was doing something simple and responsible as a father who worked too many hours and worried that he was missing important moments at home. That had been the whole idea, because my wife Sarah had been completely exhausted since giving birth, and our son Mason had begun waking up crying in ways we could not explain, which made me hope that a monitor might reveal something harmless like sudden noise in the house or a sleep reflex that startled him awake.

Instead, at exactly 1:42 p.m. on a Wednesday afternoon, I opened the live feed from my office desk and heard my mother say in a sharp voice, “You live off my son and still dare to say you’re tired,” and before my brain could process what I was hearing she grabbed my wife by the hair right beside the crib where my baby was sleeping.