Good afternoon. You do have the right to post a no trespassing sign and to prohibit the neighbor's kid from coming onto your property. It doesn't matter what the reason, it is your property and the neighbor's kid has no legal right to come on it. You might want to consider having a small camera installed to monitor your yard...they are inexpensive and can be wirelessly connected with a computer so you have an permanent record of who comes onto your property. Then, you will have physical evidence of the trespassing and can pursue whatever civil and/or criminal actions you desire.
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The information given here is not legal advice. As all states have different intricacies in their laws, the information given is general only. This communication does not establish an attorney-client relationship with you. I hope this answer has been helpful to you.