ETA: per your SWH... How the he$$ do you know or can you prove the gay son puts a webcam to the window when you are outside? You're behavior by being Mrs Kravitz is creepy. I'd be reporting YOU to the police for your snooping.
Re-read your post. YES you did equate gay and pedophile.
And you're a freaking professor at college? Please God I hope it's not my child's college!
My advice..... MOVE
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ORIGINAL...... Have you ever introduced yourself to them, communicated with them, got to know them a little in the 5 years they have been there? Maybe if you knew them, you might learn that they have good reason for cameras. What if they were victims of a home invasion or something like that years before and they are just paranoid?
Communication works wonders.. you don't have to be best buddies with neighbors but if you know each other a little, it sure helps to understand some quirks here and there.
I can't make the mental jump from someone being gay in a household to taping your family to put on a pedophile website... that is too far fetched for me. All the while, you seem to know their schedule pretty well for not knowing your neighbors. Are you creeping them out in some way be knowing their every move? Example Mrs. Kravitz?
I don't know of any legal ramifications from having a camera on property. I live in a very nice suburban neighborhood and most all of us have cameras around our homes/yards/garages and monitor them...... NOT for taping other families activities but for security plus we have a lot of wildlife.
If I were as concerned as you are, I would just ask them in a non confrontational way. They don't know you are freaked out by it unless you tell them.
In the meantime, put up shrubs, trees, and do what you can to block the camera view into your area. Ask the police about the laws, etc.
Good luck