Once upon a time, two pupils named Billy and Bob were on a plane. They were flying to New York City. Bob always brought a baseball with him. It was his favorite sport. Billy warned him to be careful with his ball. He didn’t want anyone getting hit. As predicted, Bob threw the baseball and Billy, but was way off target and hit someone and the ball ricocheted and hit a window as well! They both knew they would get in big trouble. Luckily, they brought parachutes with them and flew out the window. No one ever saw them again. The end.
Answer:
The sign for "son" is a (mutated) compound of "MALE and BABY." It is abbreviated though. The "male" part of the sign just looks like a salute. You abbreviate the BABY portion of the sign (no rocking). It sort of looks like you are saluting from your forehead to the crook of your left elbow. The left arm sometimes just hangs down during the sign SON or at least is more relaxed than in the sign for baby.
Explanation: