Jane Lindaman

A young boy goes out with his father to run errands and notices that his father's pants zipper is down. The son keeps trying to tell him but his father just doesn't hear him, until the son figures out a way to get his father to hear him.

Ages - 4 to 5
Sources - Pierce County Library

The humor is quite juvenile but then that's who it's directed at, and kids should appreciate it.

dad's pants are unzipped the entire story, despite son trying to tell him