thunderbear,
I'm not sure you can do anything about the watching and staring, but tampering with someone's mail is a federal offense and anytime they go on your property without your permission, it is trespassing. Good luck with these in-laws. It sounds to me like they don't have anything else to do and you are their entertainment.
slow
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"Don't turn away. Keep your gaze on the bandaged place. That's where the light enters you." Rumi
"The curious paradox is that when I accept myself just as I am, then I can change." Carl Rogers
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