Kudos to you for helping that poor little one out. Hopefully the mom and the son will both get some updated information of how to proeprly rescue animals in a way that will make them aware without making them defensive too. Mom is excused as she didn't know. But her son should get to see how to properly rescue a animal. He meant well, and is just a kid, but if he saw the snake given over to a proper rehabber, then maybe he can remember that and pass on that good information to others too. He must have a good heart to have tried.
I hope to hear some good updates on the rescue! Good on you for helping!