Sounds like overly nosy neighbors to me. Was like the one here a few years ago. Our friends/neighbors 3 doors away were having a birthday party for IIRC his wife's 70th. They had their kids and grandkids over (like me he's got 2 daughters). Anyway it was during the height of all the "hysteria" around the "pandemic". Our illustrious governor decided to lock the state down and tell people to "report" anyone not paying attention to his mandate. So, when he had his 2 daughters over and their kids/families she saw 2 or 3 extra cars in the driveway. And all the kids playing in the backyard. She was out there snapping pictures of the cars and lic plates, sending them to local police, and trying to shame anyone by posting the photos on to apps like Nextdoor with dire warnings about how she was "reporting" them.
The depths of nosiness.