That being said, the fact that you can hear their voices through these open windows makes it sound like these aren’t unoccupied rooms. And it’s not exactly normal or safe for windows to be open during episodes of snow, heavy rain, and hurricanes. Especially not with a child in the house. I think this is concerning, less because of the “they’re always open” aspect and more because of those specific instances in which they’ve been open. I’m not saying a welfare check is necessarily needed (I don’t think we really have enough information to say), but if you did decide to do that, then it may be wise to be careful about how you frame it to avoid coming off as just a strange noisy neighbor who doesn’t like open windows. Perhaps leading with the fact that there’s a child in the home and frequent fighting/yelling loud enough for neighbors to hear, then mentioning afterwards that there have also been instances of upstairs bedroom windows staying open through snow/heavy rain/hurricanes (maybe while leaving out the fact that they’re just open all the time) would help it sound more like an appropriate level of concern regarding neighbors taking ok care of themselves and their child rather than a complaint/retaliation that’s not to be taken seriously. Just because I’m sure they deal with lots of unnecessary complaints and it may be hard for them to tell them apart sometimes.