It does seem like an invasion of privacy, but there are no doubt more facts here. What possible motivation could there be? Do you know who these people are? It seems that it could put your child at risk in various ways. I suggest you consult with an attorney so you can lay out all of the facts. Your attorney can write a letter demanding that they stop (cease and desist). There may be some stalking issues that your attorney can formulate for you to take to the police.
You are right to try to stop this, but an attorney can go over all of the facts it would be unwise to post here.
We do not have a client/attorney relationship until you make an appointment, we discuss your case face to face, I accept a retainer, and we explictly agree to enter into representation.
I would agree with Barry, as there are undoubtedly more facts here that need to be parsed. From a civil privacy law point of view, most states have laws in place that create causes of action at common law (casually referred to as state privacy torts) under which you can claim damages. These are generally placed into 4 categories:
Misappropriation of one's name/likeness;
Intrusion upon one's seclusion, or into one's private affairs;
Publicity which present someone in a "false light"; and
Public disclosure of embarrassing private facts;
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