PHOENIX - Child psychologists say whether or not a child listens is based on numerous factors, like the development of the child and the relationship with the caretaker, but science can be working against you.

Parents are always telling their kids what to do, but how do we know they’re listening?

If they are not, is there a way to get through to them? We teamed up with three parents to put three sets of kids to the test.

Our parent volunteers told their children they were running out real quick, and reminded them of the house rules when they’re left alone. However, the parents didn’t go too far. Instead, they were sitting in a car right outside watching, as we sent a fake delivery driver followed by a kid to the house to see what the kids would do.

Watch the video above to see how these children act when a stranger knocks on the door when they're home alone.