"Brilliant!" I hear you say through the microphone(s) I've hidden on your person, "a film where parents are driven to kill their children by a mysterious radio transmission? Starring Nicholas Cage, written and directed by the guy behind the Crank films? This is going to be a blast!"
Well not so fast, my clueless friend. Your line of reasoning makes sense - it's always fun when Nicholas Cage goes full Nicholas Cage, and the idea of seeing that happen in a film about child murder that's written and directed by Brian Taylor is an exciting one - but there are two pretty fundamental problems at the heart of Mom and Dad that stop it from ever being the film you think it might be. The first is simple: Nicholas Cage is the main reason that most people will want to see Mom and Dad, but there are large stretches of it that he's entirely absent from, presumably because the film doesn't have a high enough budget to pay Cage's fee throughout. The second is... a little more complicated.